Recc. for Cable Raceway/ Wire Mold for CAT6

Hello, I am looking for recommendations for what cable raceway/ wire mold I can use to conceal x5 CAT6 cables along a stone wall. This is in an old stone cathedral and is a unique cabling situation in that there isn’t an attic or basement and penetrating the wall isn’t a real possibility.

I have looked at Panduit’s offerings but they are all PCV. I am worried about the plastic looking cheap and possibility the color fading in the sunlight (bright church interior) but I suppose it could be painted.
Does anyone have a go-to material for this use case?
Thanks for looking.

Wiremold has metal if you prefer metal.