

Yes - I have the rebranded Aussie version
https://www.officeworks.com.au/shop/officeworks/p/opel-mobile-touchflip-4g-flip-phone-optouchfp
It runs Android 8.1 and had no issue running Molly the last time I tried it. I really like that little nugget - let me know if you want a list of apps or launchers for it. Note: you’ll have to use Fdroid, Droidify, Aurora store or direct apks, as it doesn’t meet play store compliance.
If the TT990 is android 14, then it should work even better.
I can also confirm that my Duoqin F21 runs either just fine, but that’s cheating
Back to the TT970; the keyboard is fantastic (download the true TT9 app) and it even runs futo voice (albeit a touch slowly). If you get one, try to get the 1750mah battery - it helps.
Standby is just bang on 2 days for me.

Huh. Thought it was stock standard AOSP - perhaps the Aussie version is different? There are a few rebranded versions of the same hardware; you might be able to find something non proprietary. I think the underlying model is UNIWA if you want to go spelunk direct listings
https://opelmobile.com.au/wp-content/uploads/2023/08/OM-TouchFlip-A4.pdf
Where did you find the info that the TTFone uses a fork - XDA? Possibly it can take CFW?
In any case, if it’s no go, it’s no go.
PS: The other target might be a the Cat 22 flip but that thing has a face only a mother could love. I have seen clean CFW of the Duoquin models too - multiple threads on XDA - but that’s candybar not flip
PPS: let me spelunk the 8020 for a minute. I have to imagine it’s an off the shelf re-badge. EDIT: Hmm…looks like it’s bespoke enough to NOT be a simple Shenzhen rebadge job.