PubMed instead of Google Scholar, would have to use specific search operatives to find what you need though. Also Elicit.org is a site that uses AI to find articles and break them down a little. I think with a free account you can get like x amount of searches, so may or may not be feasible for you. There’s also Scopus and Web of Science, but I have no experience using those.
Either have a strong password and write it down somewhere, or use another password manager for proton? That seems kinda unnecessary though. Would be nice if proton supported yubikey or passkey or something.