That is easy. If you have a spare $100 or $200, buy a mid-range android phone.

If you have a spare $100k or $200k. Invest it to Jolla, it may happen. Or even they can share you with some private testing version.

If you have no money, code it yourself.

If you have no money nor time, why would they do it? The phone has already been discontinued. Why would any sensible party spend time and money and effort on this???!