G Suite Business Starter is $6/user. Even if you find something viable for, say, $3/user (and I really doubt so), it just not worth the fuss with migration.
I haven't gone through the process yet, but it additionally looks like I will need to borrow a Mac or Windows machine to start up iCloud Email. Once it is enabled I should be able to use IMAP or their web client.
From what I've read, on Android you just go to Settings / Passwords & accounts / Add account / Personal (IMAP) and you can use ICloud email through IMAP.
That said, if you don't have anyone in your family with an Apple product, this iCloud+ thing may not be right for you.