Sean - talk to these guys
http://www.stancedukltd.co.uk/ - bloke I dealt with was called Matt. Really know their stuff and can do custom offsets.
I was looking at buying an Esprit and was sourcing wheels for it - awkward sizes but they would accomodate and VERY keen prices.
Send them a pic of what you're after and tell them sizes and offsets required - if it's possible I reckon they'll be able to do it for you at a good price.
Just for example a set of totally custom offset Lenso BSX Golds were £585 delivered