This is a redesign of the Gridfinity Faceplate for Bambu P1P by Neebick on Printables:
https://www.printables.com/model/399054-gridfinity-faceplate-for-bambu-lab-p1p

After trying to attach that faceplate, I realized it wouldn't realistically be removable after, not to mention it was an impossibly tight fit.

I took everything right of the display portion, then entirely using the slicer, I extended the back. I did a lot of testing, several slices to split and rejoin the model (as I can't 3D model but can slice like a champ), and fit in the corner-plug from the P1P Arc enclosure.

This faceplate can fully attach via the corner plug on the P1P, as well it is the right size to fit in a top plate, such as for the Arc enclosure. As such, it is compatible with that enclosure.
There is a .3mf file which has a negative part for allowing additional support from a 3M strip, which I personally chose to use.