I'm okay with the $72/user/year price, I think that is fair for what is included. But I have 147 users on my family domain account, and it would be a nightmare for me to individually bill all of them to share the expense.

I can't see this being less than a 60 hour project for me to deal with in total, so the main thing I'm upset about is what I perceive to be a short amount of time to deal with.

So far my best bet looks like signing up as a Fastmail reseller so that users can be directly billed by Fastmail. My preference would be to stay with Google because of all the issues I think I might run into by migrating off of it (mostly related to using it for authentication for other services, which is a practice I no longer do, but did for some time).

If Google would allow each user to pay separately for what they need, then that would be an easy decision for me, because I want to stay, but I don't want to pitch 146 other Wikman's to pay me to pay Google.