Good afternoon, @a_r_t ...
If you place your cursor in the RCE, you can press the keyboard combination ALT + F9. It will give you a text-based menu with a few additional options, but it won't give you options for fonts and background colors. Those options are not available from the RCE interface. There are also accessibility issues to consider when changing things like color on your page. What are the Canvas accessibility standards? - Canvas Community
I know this might not be an answer you were looking for, but I hope it has helped in some way to answer your question. Take care, stay safe, and be well.
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