there are boot flags you can try in the nvidia graphics fixup readme on the link... but that card is also upgradable it looks like it is MXM connection i found a link they tried to upgraded to a GTX980. but i guess you can just get a HS compatible card later down the road.
yes i believe your correct on that but i think it might have broken also on some of the newer sierra updates as well. have you tried using lilu and it's plugin nvidiafixup kext
good idea posting over at IM since maybe one of the clover dev's could look into it since it has PHOENIX bios they might have a better grasp on that. or maybe the aptiomemoryfix dev although most of his work is based on clovers osxaptiofixdrv that was made for AMI bios.
BT and webcam issues can be related to USB detection issue. the trackpad you can probably adjust the "finger z" value in the kext info.plist file to your liking.
ok the issue most likely is that the bios is phoenix..... aptiomemoryfix and the older osxaptiofixdrv are intended for AMI bios. i do not know if phoenix bios you have to use emuvariable with RC shutdown scripts instead which is not native nvram.
sorry to hear that. but installing osx is definitely possible. maybe if you are using clover you should just put the kexts in kexts/other folder instead of using apps. also the legacy/UEFI issue you mention depends on the option you chose in your bios.
i think kext wizard puts the files in S/L/E so you might have conflicting versions of the same drivers in other locations including clover kexts folder and E/E