Just made some calls, and it looks like there are a couple good shops in town that can do a custom dark-colored headliner for significantly less $ than the Tesla black alcantara would cost (and unlike Tesla, their costs would scale down due to the pano roof). That would also allow me to avoid the dash inserts.
I think that's gonna be the way I go, but welcome further thoughts from those who made the plunge on the alcantara. It's certainly a nice material.