yeah this is probably a better, more cost effective route, I had a water meth kit in my previous clio rs before considering an intercoolerI'd actually suggest just water/methanol kit first before intercooler upsize if still just using stock turbo. Bigger intercooler can be more laggy. If you install water/methanol kit, then can check the intake temp drops, so might not need bigger intercooler, hence can still maintain stock response.
got to say the stock evo intercooler is a lot bigger than the micro sized ones on european hot hatches, for example here's a Megane 3 RS stock and aftermarket comparisonI still use stock intercooler on my Evo despite bigger turbo, no problems with temperature whatsoever cuz I use water/methanol kit.