Is it possible to set up 2fa/yubikey with only with a windows laptop?

sford

You're welcome! To answer your points:

Is there an advantage to using "authy" on the phone as opposed to removing it and using 1Password?

Yes. Although you can use 1Password to hold its own 2FA codes, you shouldn't use only 1Password to do this. Having an additional authenticator app, such as Authy in your case, will help prevent against total lockout. If you couldn't sign in to your 1Password account anywhere, and lost your Yubikey, you'd be stuck, because your 2FA codes are inside the thing you're trying to unlock.

As we say in the article, Turn on two-factor authentication for your 1Password account:

Although 1Password can be used to store one-time passwords for other services where you use two-factor authentication, it’s important to use a different authenticator app to store the authentication codes for your 1Password account. Storing them in 1Password would be like putting the key to a safe inside the safe itself.

(emphasis original from the article)

So having your 2FA codes for your 1Password account available somewhere outside of 1Password is definitely a good idea.

Is it worth it at this point, or is it best to just to leave things as is and move on?

I would say that now you have Authy set up, you'll be good to go. Bear in mind that you can't export secrets out of Authy, so make sure you always have access to it, or your Yubikey, so that you don't get locked out.

Note I only have set up 2fa on 1Password and Yubikey, no other accounts yet.

Sounds like the next job on the list to me! 😄 You can use Watchtower to help you find accounts which support two-factor authentication but don't have one-time passwords saved in 1Password:

☞ Use Watchtower to find passwords you need to change # Identify logins that support two-factor authentication

Let me know if you get stuck at any point. :)