In my opinion the TM2 isn't a converted 4wd anyway. Yes it uses the rear mouldings etc of a T4, but the chassis is bespoke to the tm2 and the motor mount is in a completely different position. You certainly can't just stick a front drivetrain in it.
Take the front driveshafts out of a T4 and it still won't look anything like a TM2.
Can't deny it's nice to only have to carry a few spares as there is a good crossover of the same parts though!