I’d like to try swapping on a late model smaller flange (some have had success, some haven’t) before dropping coin on another transmission, although if anyone has a good one of those I might be interested. If you have a 325i trans sitting around with a bad synchro or similar, this would be perfect - I’d be willing to buy the whole transmission. 
 

For reference: the eta cars all came with the larger giubo, while the i cars got the smaller one.
 

Thanks!