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Hopefully it narrows it down to one of the wheels at least.
Then it should be a case of the magnetic ring or the sensor.
Best case would be a rear pick-up ring as they are replaceable for cheap.
I've used the W5 on the Clio and they were great, last ages but the bite wasn't as strong as CL RC6.... So the W6 or 6.5 should be better.
Quite a few of the Megane lads run W7 which must be savage.
The brake switch is adjustable, it's a ratcheting type plunger.
Keep adjusting it until you get the lights coming on with minimal pedal pressure.
Failing that it could be the steering angle sensor.
Needs to go to a proper AC place really.
Kwik Fit don't even do it right most of the time.
The hissing noise is just the system low on refrigerant (or at least it has been on cars i've had).
As a ballpark, Clios tend to take around 400-500grams of refrigerant (from memory) and you certainly...
If they are factory fit items (which it sounds like they are, apart from the repaired exhaust) then the insurance are idiots and you need to argue it with them or get the ombudsman involved.
You won't get the right one on Euro based off the reg for some reason.
These are the ones you want - 617745225
https://www.eurocarparts.com/search/617745225