Want to switch from LP to 1P, but hit a deal breaker. Solutions?

Today's computers and apps are made for personal use, not shared use. It's a dilemma if you share one account (Windows) but have separate other accounts (1Password, Browser).

If you change your workflow slightly and really use different Windows logins for every family member, it would be much easier with everything that has to deal with user specific things and accounts. It's not difficult to change between Windows sessions. For each family member, create their one Windows user. Then click on the start menu, on your user icon, then switch to a different user without logging out yourself. Your session gets in the background and you get a new session for the new user. This way you can switch back and forth windows sessions without effort. Apps stay open in background. A good side effect is that any changes you make to your user environment will not disturb other customizations your family members made and vice versa. Most desktop apps are installed globally, you install once and everyone else is using the app - with his/her own settings and customzations.

Use a simple Windows Hello PIN for fast login, so it's really easy to switch. The 1Password app on Windows is also able to use Windows hello, so it's easy to unlock with it as well, so both of you can your own 1Password login and vault.
If you enable TPM use within 1Password, you will be asked for the account password only once every 2 weeks instead of on every reboot. The other unlocks are with Windows Hello.