You could maybe flash mikrotik with openwrt? That way you avoid mikrotiks ui etc. Openwrt doesn’t support wifi6 think

Closest I’ve seen was rooting a printer via a security exploit

https://european-alternatives.eu/category/email-providers

I use mailbox.org and point it to my own domain (optional). They’ve been brittle the last couple of years but in the beta they actually have OTP 2FA and per-app passwords now.