Its not that hard to change to a V6 manual box if you had a V8 manual box in there to begin with. Just change the bell housing and input shaft, you will also have slightly lower ratio gears in the V6 box so speedo will be out but it will give you a bit more acceleration.
If ive of had a V6 T5 handy at the time i would of swaped it with the V8 one.