Chi , I now officially give up.
You say you want to cut down the collection, but now want to spaff thousands of pounds achieve a whole lot of not a lot????
You've already got VAG engined Clio, the kind of person that does what you're talking about is normally someone with all the tools to hand a decent amount of skill, then it's just something to dick around with.
I mean this in the nicest possible way, but is there any reason you seem to enjoy blowing cash on what are essentially s**t cars? Like, are you building some sort of small army of motors? I'm now of the opinion that I actually don't get it.