I used my Sunday time in lockdown (measures are more loose over here) to go through my hometown and gather some material of how Cyrillic is actually used here. I know some font designers like to look at hand drawn letterforms, so I picked the most everyday ones I could find and put them in a huge PDF (500 MB) so you can look at everything in detail. Hope this helps!
I take no sides in the whole "BG vs RUS Cyrillic debate", it's just how I choose to roll.
The document includes commentary and some translations (and some fonts I worked on