Disco 1s could be had with an R380 5 speed manual stateside. But they're rare-ish.
@argatoga can unsell you on the ownership experience ?
I'm an idiot that lusted/still lusts after one and even I bought a Toyota product as I liked the concept of my daily being reliable and offroad capable.
And I breezed through that LS swap thread.
Lots of work to be done on the wiring harness, vendor stopped offering the kit due to shade tree mechanics not being experienced enough. One dude ended up over $10k into the swap. Lots of work on the refining end after the swap is done.