If you had standard(ish) power you could use the auto box froma boa 24v granada no problem, they have beefier guts, you would just need to sort the bell housing to suit the four pot.

I've seen a modified borg warner T5 with the bell end of the A4LD for the 24v to be driven manual. No reason a good transmission shop couldn't do the reverse.

You would be the king at the lights