I don't have a Pixel 7Pro, but I use GrapheneOS on a Pixel 5. From your list here are the apps that I use that works with the google play sandbox:
- Blizzard Auth
- Microsoft Auth (I have a work profile with Teams, Outlook, OneDrive and Office. All apps are working fine)
I don't use Barclays as a bank, but my banking app works fine. I use ProtonVPN and Bitwarden, both works fine and the auto-fill features from bitwarden work fine as well.
Hope that helps :)