I'm not sure I'd ever do this, but if I ever ran across a RHD steering rack, I'd add it to my parts pile for sure. Other than the brake/clutch lines and dash, I think that's all I'd need.
Barry, my TR4 was like that too, with the handbrake on the passenger's side (hand brake on the RH side of the transmission tunnel). I never had passengers, as there wasn't a passenger seat, so it was never an issue.