I think the launch control wasn't used because from what I read on Wiki (yes, pinch of salt blah blah) driver aids like traction control are deactivated.
Im guessing you mean put a rb20det in a R33 GTST, which normally comes with a RB25DET?
Sounds like a complete waste of time and effort, but the reverse has been done many a time, and if you really want to it could be done.
that really sucks, but as others have said, I think it should come out, take it to your local smash repairer/paint shop... better than a brick to the window, I've copped one of them before