If all you care about is the toolbar, you can just edit it directly, there is a config option for that; see http://docs.ckeditor.com/#!/guide/dev_toolbar
Although I would also keep editing that ACF configuration to find why images and fonts don't work. As for the images, I think you need to give it a little more room to work than just img[!src]. As for the fonts, you are not allowing span, that might disable the font styles. The styles like spans a lot. Here's an edited version very similar to what I use, edited to fit your situation a little better.
// No other tags are allowed the ones defined.
// http://docs.ckeditor.com/#!/guide/dev_allowed_content_rules-section-3
// [*] allows all attributes
// (*) allows all classes
// {*} allows all styles
CKEDITOR.replace('textarea_id', {
allowedContent:
// Allow these without any style, class or attribute
'b i u s sup sub ul ol li tr td h1 h2 h3 h4 h5 h6 hr pre; ' +
// Allow any attribute and certain styles for TD and TH
'td th [*]{width,height,text-align,vertical-align,white-space,border-color,background-color}; ' +
// Allow any attribute but only height and width style for table
'table [*]{height, width};' +
// Allow any attribute and style - this is a little too loose
'p span img a tr thead tbody a caption *[*]{*}; ' +
// Allow any class for any element
'*(*)'
});
I don't recommend simply just copying it from here, but rather trying to understand it and choose the correct tags for you. The important bit I think is to add more freedom for IMG and adding SPAN, but if you Grok the ACF it'll help working with CKEditor in the future.