That'd be a no

. The only other remotely viable approach is a full custom Qt5 stack (àla pbchess/UMR).
Fair warning in advance: Whatever you go with, input is going to be a major PITA. There's a reason almost nothing out there handles all the corner-cases properly, except for the stock Qt QPA, which we can't use, and Plato. KOReader is a close second, and that mainly because it forgoes hardware rotation handling (and what little it deals with on that front is relegated to FBInk via fbdepth), which avoids a nice chunk of the potential issues.
(Purely coincidental example:
https://github.com/llandsmeer/inkvt/pull/14)
Out of curiosity, what's the hangup with FBInk?