Thank you for kind words. There is a PR open for donation of new adapter code from @kgoderis: Pure Java Comm - Initial Contribution by kgoderis · Pull Request #3632 · openhab/openhab-core · GitHub.
It was intended for Apple silicon which is not yet supported by nrjavaserial. I am not sure what is state of acceptance for this work, because there are other implications (serial over tcp and eventual latency of non-native implementation).
Anyhow - regardless of PR I am going to keep this provider alive. I was really tired of locking issues with nrjavaserial and its inability to work properly on stock arch linux. I recently managed to compile it with liblockdev, primarily to test jrxtx for wireless m-bus binding, and it was far away from joy.
Anyhow - I will try to streamline your experience a bit with bunch of docs and simpler installation procedure (ETA until end of this year). I also have a serial test command to verify if port is accessible within OH shell itself.
EDIT (6.03.2024): its done: Provide KAR files for serial port utilities · Issue #42 · ConnectorIO/connectorio-addons · GitHub