I did the same but went from old Toyo t1r which have lots of tread left to Yokohama AD08R. I did consider the PS3 but the AD08r is just a next level tyre.
Someone get a price on Ohlins for a Clio Trophy. I think 2-3k is reasonable. Anything between 3-5k i'd think twice about. For that money AST's valved to suit would be my next best bet.
I found this shop via google search. They have some example Recaro seats that they have retrimmed in tweed and the quailty and craftsmanship looks spot on. http://www.edgeautomotive.co.uk
Yes they are difficult and time consuming to powdercoat, easy to do just the top caliper brace abc that’s it. I’d guess time and effort would be a pita. Easier to spray paint yourself with some rattle cans from halfords and clear coat on top.