Welcome to the forum and congrats on your new Reatta! It looks like it cleaned up great. I'm sure you will enjoy it when you get it back on the road. Lots of knowledgeable people here willing to help you do that.
Good question. Not having seen what the 1996 strut housing looks like, uncertain how that would work. If anyone has a 1996 Buick Regal front strut insert holder, it would be interesting to look at and pull some dimensions from it.
The design I am conjuring up would allow for the insert to be replaced and the adapter could be reused.