I think other than redrilling the actual wheels, I'd say adaptec wheel adapters are the safest way to go. Fully custom made - adapter thickness, your car bore size, wheel bore size, pcd, different finishes on the adapters, the list goes on.
Only downside being that the thinnest adapters they make are 15mm which would somewhat limit the choice of offset on the 114.3 wheels for our golf guards.
You've probably heard of wobble bolts before but here's a good video that explains the basics/concept.
The bloke's been using wobble bolts to fit on 5x114.3 wheels on his MK5 GTI for years now and it seems like wobble bolts aren't as bad as they sound.
Also check out the different wheels he's had over the years using wobble bolts: http://squarespokes.com/volkswagen-gti-mkv-2008/
Hes running TE37 SL's at the moment and I think I'm in love haha: