OK. I've used VHB extensively in the past. Most of it is foam-based but I guess you're right - there are "solid" versions. The stuff is ungodly expensive though. I was kinda hoping there was a cheaper option that would work for this application
I have used the fastcap two sided tape quite a few times for fixturing. I am not sure how well it will work to the aluminum. I glued my aluminum tracks to my phenolic.