Do Gmail's app passwords not work with yubikey? I know that with totp 2fa enabled, I can generate passwords that bypass the 2fa codes. There also might be some way of using a 2fa code in the password field as well (PayPal used to do this, you just appended your 2fa code to your password).
Nextcloud or owncloud have calendars/contacts sync iirc, but I'm not sure how well it works.
I meant I won't manage calendars with my own domains. I'll be using a personal Gmail account to manage my calendars and contacts. But no critical emails will pass through Gmail and no financial or similar accounts will be tied to it.
Nextcloud or owncloud have calendars/contacts sync iirc, but I'm not sure how well it works.