I use OpenBoard most of the time and it's good if you are more privacy focused.
F-Droid
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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Is it possible with this keyboard to swipe instead of type?
No, it's not possible by now
If you install a fork of it with that feature, yes. I personally use this fork: https://github.com/erkserkserks/openboard
I use AnySoft Keyboard. It is very configurable and has a lot of language options.
Haven't seen unexpected keyboard mentioned. Been using that for a few months now. Lots of keys, not many other features. With a compose key, it would almost be perfect. Hackers is my backup keyboard.
Vanilla GrapheneOS keyboard as per their guide.