If all your using is the pan just plasma cut out the serial plate on the tunnel and find a old rusty rotted out junker with a clear title and switch the plate.
As long as you own both and destroy the unused vehicle buy parting everything out, your still honoring the salvage law by disposing of the unfit car and surrendering the salvage title, and all remaining junk parts. You have one good title and on good car. That's all ya wanted. Cost wise , your not hurting at all so far. If you can find a cheap junker of the same year your setting pretty.
Even better, If you remodel the tunnel at the k frame to make room for better seats, also making it look more genuine by losing the Y part. You will have to remove the serial and put it back in the straighten tunnel anyway . You could flatten it out and use it as a cover over the shift coupler.
I have been working on conversion for that very procedure, for over a year in my head. The E-brake cables will be the only hassle.
Der R veays around this mess.