The vacuum technique works with new layup to draw off excess resin and improve the bond, but I can't see it being effective with an existing skin.
You can use screws rather than braces - in fact, I think that's an excellent idea. However, don't leave them in. Coat them liberally with car wax before screwing them in and remove the screws and fill the holes the following day.
I've also recored from the inside for the reasons you've suggested. It's a fine way to go, just a bit more difficult.
