I was in the same boat but made the shift a month or two ago. My family and I created free Google accounts. I bought a subscription to Fastmail I have multip

I was in the same boat but made the shift a month or two ago. My family and I created free Google accounts. I bought a subscription to Fastmail I have multiple domains sending mail to Fastmail Fastmail has rules to forward to the free Gmail accounts. The free Gmail accounts reply from the address they are sent. All been working well. I like Gmail/Cal which is why I have stuck with them. This setup however gives me the freedom to move to a different mail client or calendar if I choose. The only reason I wanted G Suite Legacy was for custom domains. I would have paid Google for this service. I think they dropped the ball there.