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Finland has quite a lot of Rally4 cars, mostly Fiestas, but also 208. And at least 4 Clios. In Finland it's not possible to follow cars by reg plates as those are temporary stickers.

Dampers are homologated, so you can't change the brand. Their lenght/stroke is homologated also so basically only shimming you can change.

To be precise, there was no restrictor at all until now

No exact idea, I don't have that much experience with those Rally4 cars, weight won't be that big issue, I think restrictor will be worse for 208 than for Fiesta, but we need to wait and see...

it's just below 6k for upgrade kit, plus some labour of course. Also you can buy separate parts of the kit and update step by step, etc.

The differences are:
different turbo inlet pipe (plus turbo adapter), bit different exhaust (less backpressure), different spark plugs, different ECU mapping, different rear beam (more flexible),...