i am not sure if the declare font stuff is still applicable.
I always remove all font family stuff, from my ready- to-read copy of epub, as otherwise the kobo reader selection controls do not work.
I then sometimes calibre-convert that ready-to-read version to azw & put in onto my kindle fire or voyage - I have never noticed any inability to then change font - though as I like caecilia it's not something I have tested explicitly...
...so , opening my Kindle voyage & going to first side loaded book ( which came via epub with all font declarations removed.. ) yes I can select any of the available fonts.
NB I use azw3 , not mobi, dunno if that is a factor.
I reckon that if I turn on my fire tablet and add a book or two, I will get same results there.
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