If Andbox is indeed possible to port and Whatsapp can be installed that would be an immediate change to Leste for me.

The only thing I really need on my phone is Whatsapp (for business).
I can live with not having telephony 24/7 (prefer a stationary voip phone anyway), but having a working telephony app would be my 2nd on the list

Rest is nice to have (and from that list emacs would be *very* nice to have)