REVISED:
Try this ugly brute force formula, in CoverSheet!S2. See my sample tab in your sheet, GK-Cover Sheet. It includes the column label, as the first line of the array:
=IF(N(" Index into the CHOOSE formula below is: 1=Sun, 2=Mon, 3=Wed, 4=Wed, 5=Thu, 6=Fri, 7=Sat, 8=Sun")=0,{ "TODAYS ARMING 1 TIME";
IFERROR(INDIRECT($A3 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A4 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A5 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A6 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A7 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A8 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A9 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A10 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A11 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A12 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A13 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A14 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A15 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A16 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A17 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A18 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A19 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A20 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A21 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A22 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A23 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A24 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A25 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A26 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A27 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A28 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A29 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A30 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A31 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A32 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A33 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A34 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A35 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A36 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A37 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A38 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A39 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A40 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A41 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")));
IFERROR(INDIRECT($A42 & CHOOSE(ROUNDDOWN(($AB$1-0.374))+1,"!H79","!H67","!H69","!H71","!H73","!H75","!H77","!H79")))},IFERROR(1/0))
My earlier formula attempt obviously failed since I'd overlooked how ARRAYFORMULA resolves any INDIRECT text strings BEFORE processing through the cell range.
So here I force the INDIRECT string resolution for each row, prior to generating the array. The N function in the first line is used to include a helpful comment within the formula - N("... any text...") equates to 0.
It's relatively easy to maintain, provided you aren't going to 100+ columns. I believe I have the math correct for the CHOOSE function, but please verify.