I'd wager part of the 7R team has already been moved over to a remake of 10.
Rebirth is about 6 months from releasing. It must be content complete and just polishing up for the most part at this stage.
The final part was seemingly pre-planned years ago and we know started development early last year. The creative planning is all done and I'd guess development will go even smoother than Rebirth. So the creative team, Kitase, Nomura, Nojima, Hamaguchi, Toriyama, Hamauzu etc... must be free'd up to produce a remake of 10 and it would be quite straightforward as you say.
UE4/5 has been a blessing for the BD1 team.