I am actively working towards it. The phone is def TCL....a lot of the package-names give that away. I installed a new Linux distro yesterday in hopes of getting to the bootloader. There might be an added advantage to loading a DSU in Developer Opyions...will update ASAP.
I know little about Android development but I have the device it's not my daily driver so I can test stuff on it and if it goes south it's no big deal. Btw the revvl 4+ is the Qualcomm model, the 4 is the mediatek soc.