what we’re looking at is cleaning up the [real] efi area _and_ using the efi boot manager, all done in the android half of the flash, as in the screen with two icons — installing windows does finalize adding the second icon.
clean gpt/efi area yourself, and run the windows half of flash and hope it works, and it actally should .. those parts of the win10 flash script will err out (dealing with android partitions and old windows parititons) so with no real effects
I say keep android, but what I would consider doing is from bios change boot selectiong from bootmanager (androidia — which seems to be a master efi boot manager that will in turn chainload the real android bootmanager/loader) to windows — practice this first and watch it go to windows .. SO, leave the bootloader alone, bypass straight to windows and just kill all the android partitions and make a new windows drive =)