No sense dreaming about what may fit, unless either you or somebody else actually makes products to allow you to fit it to the engine/car.
DIY swaps like that and to get them right are not an easy task. Unless you have good access to machining facilities, or a hell of a lot of patience to fabricate yourself.
Jeeps use the AX15 which I believe is an incarnation of the R154, albeit probably not as strong. Would find one in a UK 4.0 Wrangler.
At the prices being talked about it'd be a lot handier just to sell the auto and buy a manual Supra ? Job done.