Back in the day, some of my car club Westies had a line plumbed to a dive reg inside the car. I think one guy still does.
Croc your a man after my own heart, never turn down a good deal If you get stuck I'll buy it off you and shoe horn the motor into a 750 Kat popup headlight frame...
if you also have the seat,tail,tank,pop top and panels etc I am prepared to extend the same offer in reverse.