I tried this out last night with my wife and I. I was on a computer with Java and she was on a tablet with bedrock and it worked pretty well. After about 2 hours of both being on the same server I only had two instances where it seemed to lag. Both were about a second long. 2 seconds out of 2 hours isn't bad considering the setup. Thank you for that. I am curious how it will go as we add more people.
I did notice that the GeyserMC plugin showed compatibility with version 1.19.0, but the button to install was not green like most of the other plugins when they are green to indicate compatibility with the installed version of MC. It was just the standard black button to install. That threw me for a moment and caused me to double-check my version and the GeyserMC version. I went ahead and did the install and it worked like a charm. No extra configs needed - just jotted down the server info and handed it to my wife, found the place to enter it in multiplayer and we were in.