nope

I tried what you are suggesting. it leaks. and yes I do trust Proton's VPN and their DNS. I get why you think it's better, and so did I when I first started with privacy and security but it's not a good idea.

Why would you trust Google DNS (or CloudFlare) anyway? Google's business is selling user data, I highly highly doubt they are not tracking DNS and selling it. They just want your DNS queries rather than your ISP having it.

do you want me to show you DNS leak tests both ways?

It's privacy washing basically