Ha!
It's just too distressing for my tiny brain to contemplate mate!
All that awesome work on that lovely car!
Absolutely get the feeling of wanting something else, but so soon? You've not even had time to enjoy it. And sure, the Cayman can be tweaked to be an absolute weapon with a few mods, you'll need pretty deep pockets though.
However, if you are going to do it, you'll definitely get a hell of a lot more if you return it fully to standard. AG cars always seem to fetch decent money and you have some good mods to build up funds with.
Not looking at immediate sale mate, will keep the Clio for the rest of this summer to enjoy and then look at potentially returning to standard end of the year. All ideas at this stage.