There's no reason why it can't be supported. ROMs like Graphene have been supporting longer passwords for ages so seems like some arbitrary Google restriction. Yet another reason why I stay degoogled.

I've been using a SL address for my domain contact for a couple of years now without issues (.com domain). I would recommend going for a TLD with whois privacy, as that allows you to redact addresses and phone numbers as well.

I use cash only. It helps to control spending but also my bank doesn't need to know each and everything I buy. Local businesses appreciate it as they get the full amount and there is no cut taken by card processors or banks. And as the recent CrowdStrike outage has shown, being 100% dependent on digital services is not ideal. I have to deal with change, but that's a small inconvenience I'm willing to take.