Coil Overs & Lowering

I’d like to hear from owners who have solved the drive shaft too long length problem when lowering the Octy 2 having added coilovers because I ran unexpectedly headlong into this problem having been in the workshop for over half a day doing camber and toe.

Although the VRS is already lower from factory, I needed it a bit more. Not so I have it in the floor, or get stuck on speed bumps, but a sensible amount. 
 

initially using the full length of my BC Racing coilovers, appeared just right, but a road test quickly revealed a bad problem of rumble that many seasoned members who have done similar mods will be familiar with. 
 

Back in the workshop we raised the car back up about 20mm, but unfortunately that’s not enough to get rid of the rumble and it’s not how I’d like the car. 
 

A discussion in the workshop ensued, where it was mentioned that this problem is common on VAG vehicles; the way to solve it is various, some more problematical than others, involving engineering, or buying some very expensive after market solution.

After speaking with a friend who owns a machine shop, he mentioned that he could (1) cut down the standard part, taking 10mm out of the length, welding back up and sending somewhere to get it balanced as he could not do that part himself. However, he had another suggestion which sounded interesting and told me that he had done this with his Audi TT when he lowered it and it involved finding another Vehicle in the VAG group which had the same engine type and gearbox but ran a slightly shorter driveshaft; so he was able to get his part from a MK IV golf. Despite his TT being from the MK 5 type platform the MK IV parts worked.

I’d like to avoid the engineering part, and see whether I can identify another vehicle in the VAG group, running a DSG gearbox and diesel engine of 2 L capacity.

so the question is: have any of the esteemed members here encountered the sad issue, and solved it with driveshafts from another VAG group Vehicle?