I don't know how subjective the talk of clunky keys is in this forum, although there does appear to be a lot of posts. I have just acquired a Casio PX360 here in the UK for a very good price, brand new with the extended Casio warranty. Arriving in a couple of days. This Casio's keys will be measured against our Yamaha Clavinova CLP-360 (pure coincidence on the numbers!). Years old but great piano, imo. If it is quieter than the Yamaha, then I won't be fiddling with draught strips .
Update:
I received my PX360 today. Over the moon with it. Same noise level, I would say, as my Clavinova. I am not fussed right now, but I will monitor it. If things change over time then I will do your mod, LJG. Love the keyboard, love the feel, love the screen, love the sounds! One happy chappy. 😎