So, time to renew the brakes.
I bought some drilled Brembo HC discs. Thing is, they are "only" for the Meg 2 RS according to Brembo, but should fit on the Clio 3 RS too. The only difference is that the Meg 2 RS discs have a minimum thickness of 26, and the discs for the Clio 3 RS have 26.5...