Labelled the panel with waterslide decals. The decals are coated in 3 coats of Krylon Clear Matte UV protectant, then placed on the panel. Once dry, I will spray the entire panel with the Krylon to secure the decals in place.

UPDATE: I tried to remove some of the decals for replacement. It was very difficult to scrape them off with a fingernail, and I had to use a bit of water and work hard at it. I will likely not coat the panel in Krylon clear to protect the decals. This makes the decals 'semi-permanent', which has some advantages if I make future changes.