The more investigation i do the more convinced i am that the *simplest* solution long term will be to approach a few wheel manufacturers (like Rimstock and Image) and get someone to produce something similar to the original OZ magnesium wheels but in aluminium alloy.
Yes, they'll almost certainly be heavier but i would hope they would maintain the slim 5 spoke aesthetic, the centre lock functionality and appearance, and be easier to repair or refurbish as well as having more longevity.
Once i have found my car i may look into this myself, perhaps even try and ascertain the viability of a "group buy" with each participant being able to buy 4 or 5 wheels.
I'm guessing with a couple of hundred S1's out there and the stock of replacement mag wheels having now been depleted there could well be demand going forwards.
@Taffmog - very interested in your conversation, if you do remember who it was i'd be grateful for the information.
@Alistair - the S1's didn't have ABS so i wonder if the driveshafts are the same, they could well be but without the hall effect sensor there maybe that's why they don't suffer with the ping ping noise? Nothing to rub against.
Is SimonH the chap from SiFab?
I'm also in discussion with AnDrew about his pair of S1's, hoping to see those soon, as well as having feelers out for other cars.
I really like the S3 at Williams but can't quite get my head around the price tag.