If you just want the UBE head, you can use High Poly COTRUBE has more detailed customization of facial features, better lashes and the option to choose them (like in COTR...but COTR's head is shit, to be honest). It also has extra facial expressions in racemenu (just a thing for screenshots).
I don't see a big problem in editing the head textures to make it match after the main work is done(fitting the head model to 3ba body). COTR exists (also the head from DAZ), as well as ports from other games
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UBE head is still better. It is not possible to just take the head because they use completely different Normal maps from vanilla. UBE's is dynamic allowing things like muscle and deformation change real-time with sliders.