Hi Pilou

I own Procreate on the iPad Pro. But I could not try Procreate 5.2
yet. Because I need to update the IOS to at least 14.4 first, I'm still on 13.5.

And I think MOI will not be enough because you need a UV-MAP to paint
on 3D objects in Procreate 5.2.

On the iPad, the sculpting app "Forger" can create UV-Maps.
Or you can use Blender on the PC/MAC.

The App Nomad, which I love for 3D modeling on the iPad
unfortunately can't create UV maps yet.