I've got some from my MX-5 that will fit a Clio. Black, 8 or 10 spoke, something like that. Straight, not kerbed, bit tatty generally, but perfect as track wheels. Got some T1Rs on at the moment which are hilarious fun, fronts on about 6mm and rears 3-4mm tread. £150 delivered or £120 if you want to pick em up?
Not massively - I've seen a few Oulton days this month for £99, Cadwell at £89... and it'd save a lot on travel costs too.
Definitely see how it's ideal for you though Mike, dead close!