If you want to shift a MT-82, then swing by your local Ford dealer on your way home and drive a stick mustang... IIRC, the mustang variants, ford Transit and defender transmission all come from the same plant in Halewood
Here is a view of the puma driveline:
http://www.landyonline.co.za/specs/specs_images/defender2007_engine.jpg
And here is the 6MT1500 on Getrags website...
http://www.getrag.de/en/235
Compared to the R380, this is a fantastic trans - huge ratio spead (7.33 vs 4.39) compared to the R380 makes it ideal for engines with a wide torque spread - but less ideal for a road racer who wants short ratios.
I look at the above pictire of the Puma driveline, and see no reason at all why this couldn't be mated to a TDi. A new/modified flywheel housing and/or adaptor plate, and the usual flywheel/clutch combination that would be pretty easy to work out, and it'll work surely? It looks longer than the 380, so driveshaft mods, new gearbox mounts, and probably trans tunnel mounts are probably on the list, but I can't see why this wouldn't be a great upgrade for those running defenders who want a better driveline.