[Messages/fontext] Proper transliteration / bitmap converter option for regional + emojis

This is not proper bug report but rather question for guidance due to my lack of ability for searching codebase of gadgetbridge + banglejs.

With fontext I was able to achieve regional font in messages -> emoji is changed to ascii

With fontext and "text as bitmaps" option in gadgetbridge emoji is proper but now regional characters are also converted.
This is same behavior as if I didn't install fontext package.

I tried also mess a bit with transliteration options but no luck there.

This is a bit annoying since messages font is scaled based on how much text will be visible. Bitmaps stays same size tho.

As for now I am almost certain that problem is with my setup or gadgetbridge function to convert problematic strings but I post it here that most likely somebody can help me get proper info before posting it on gadgetbridge repo.

I use combo of nightly builds and 2v26.1 fw

Thanks in advance

Screenshots:
Baseline with or without bitmaps:

Good emoji (bitmaps mode):

But bad regional chars (bitmaps mode):

Good regional chars (normal mode):

But as expected no emojis: