Eliminating fuel boost cut should be as easy as simply capping the Vtsv the vacume line that goes into the boost cut solinoid… its pretty simple! Cap it off and it will never read fuel cut.
but, you will want to replace / get Map2ecu if you want to run more fuel with that motor.
C12’s really are not bad turbos, friends of mine who have had them they run for a while and spool very nicely.
All JDM 2jz’s are all ceramic so any swap you get jdm wise will be ceramic as well. But who keeps stock twins anymore!