I just thought about a plus for the Jetta donor last night: if the car came with keyless entry (and your van doesn't have it) it'd almost certainly be able to accompany the swap.
Regarding the long-nose vans, I don't know anyone with one around here to get a close enough look at them. Take a look at your fusebox: if it looks like this :
then it's probably a very similar wiring situation. If it is closer to the MkIV platform with much smaller fuses you'd probably have to do a fair bit more work. I strongly suspect it's the former case, which makes it much easier.
I don't really see the point of installing an ALH over an AHU, with regard to performance, except for the somewhat more sophisticated ECU when the weak points (pistons, injection pump pressure, VNT vs waste gate turbo)— all of which can be mitigated and retain the easy mounting.