No-sage

I used the stewmac stuff in your link to reattach mine, but I fully removed it, flattened it and put it back on. Once I removed the guard, I could see the previous owner had the pick guard reattached also. I don’t think there’s anything that’s going to keep the lifting parts down honestly. The tendency to curl very strong.

I can’t offer any info on the value of your guitar, but I know of a local dealer that has a Les Paul you painted for sale on his website. Here is a link to the listing: https://chrisguitars2.com/product/gibson-les-paul-bugs/