I won't be much help, but I'm thinking about the same thing so I can paint from there down and hide the paint line.
How I'd go about it since you have a whole parts truck is to carefully remove it, maybe just one side at first. Meausure all the hole locations and diamater, get some touch up paint to cover the bare holes after you drill them, let the paint dry put the clips in and hopefully it will all go on.
If you attempt it post it here, with pics if possable. I may try to install my trim before I start the patching so I can get the holes painted in.
"Let's see that Red Blue Green **** sucker build one of these without duct taping it together!"
87J20 Member, FSJ Prissy Restoration Association
Parts vehicles: 1.5 Wags, 3.5 J20's, 1 J10 1 J300