I don’t know how well it measures up to privacy standards at the level of GrapheneOS, but Ollee might be of interest to you if you want to go the retro route. It lets you convert a standard Casio F-91W into a smartwatch.

Here are some password managers that are either based in Europe or are Open Source: https://buy-european.net/en/category/password-managers

You don’t need SteamOS to play games via Steam on linux. Just use any linux distro (preferably one that supports newer gaming hardware), install Steam, go to Settings > Compatibility and “Enable Steam Play for all other titles”. There’s a drop-down that let’s you choose different Proton Versions (some work better than others, hence the config-reviews on ProtonDB to see what works).

For gaming you can just use steam. You can see which game works and the corresponding distributions/configurations on ProtonDB; Helldivers 2 get’s a GOLD status (https://www.protondb.com/app/553850).

I bought a Portable Power Station (e.g. Anker SOLIX C300) to use as an Uninterruptible Power Supply (UPS) for my homeserver (~ 40 Watt) to buy me - or better my utility company - a few hours in case the power fails.

:)