I did it. I started with the standard backings, but had an order in for the locking backs with the set screws. I lost 2 of the standard backers just in the week or so before I ordered the set screw version. Since installing the set screw backers, I have not lost a single backer. Was concerned about the comfort of the longish backers poking into me, but I don't notice them.
While this isn't the "screen accurate" way to do the attachment, I love it. Mistakes are very correctible. It is easy enough to remove a plate and return it. Even if I were going to do the "screen accurate" eyelet and bolt way, I would glue in the pins, make my eyelet holes, install with the jewelry pins, and then mark my bolts for gluing in.
I have no plans to do that, though. This method works great on its own.