From what I have seen, 17" wheels are the smallest diameter possible with the Megane 225 Calipers and 300mm SVT front rotors. Take a look at the clearances with 17's in these install videos:
View: https://www.youtube.com/watch?v=wUpL6ITt028&t=471s
View: https://www.youtube.com/watch?v=yTYqu10pZ_M
Even my kit, with 278mm rotors and the monoblock calipers, require a 3mm spacer with the dekagrams to clear the front face of the caliper. So your kit definitely won't work with the dekagrams.
Even my kit, with 278mm rotors and the monoblock calipers, require a 3mm spacer with the dekagrams to clear the front face of the caliper. So your kit definitely won't work with the dekagrams.