Correct ansswer is I don't know. I'd suggest directly asking the hack creators if they might, or if it can even be done. This is not a new question and I have yet to see a response suggesting PPC Flash will update beyond 11.5.
Eventually we will all leave our beloved PPC's to our collection, just as the 68000 series, versus our daily user. My PPC units still work great with iCab, TFF and the 11.5 hack. Toss in YouView or Mactubes and my old units are perfectly acceptable. If you demand the latest and greatest, like 4k or streaming HD, well, it's simply time to open your wallet.
Long live the PPC, have a great day!