I would strongly recommend that you stick with IM for a new hood if you go that route. Different makers will use different molds to produce their hoods and doors and one from Special Edition or Rusty Tubs (if available) probably will not fit precisely and will need a similar amount of fiddling with to make it match your IM body.
You old hood could be brought back to life, but without seeing and measuring it and pre-fitting it on the car to see if it is warped, I can't comment on how much work it might take. A decent autobody shop used to working on Corvettes, or a boat shop that works on fiberglass mods would be able to tell you if your old hood is re-useable.
I have seen one other car that had the hood pop up like that, but while it destroyed the windshield, the hood stayed attached (more or less). It still needed a bunch of work to repair it, but it eventually came through OK. Merklin's body shop friend bought the car, spiffed it up and re-sold it a few years back.