Hang on, salvage title as in irreparable? If so, your option is pretty clear. If it's not irreparable, is it more work to fix it and have an integrity inspection done than it is to swap everything over? My gut says no, but you know the cars better.
If you register a salvaged car and it gets written off a second time, you can still fix and reinsure it for yourself. But if MPI buys it, then yes, it's game over for that VIN.