Just wondering, is the original Gadgetbridge repo not willing to accept code to merge?

They're also on Matrix: https://matrix.to/#/!KlgIJeiotNGZkxSqRi:matrix.org

Nope

https://codeberg.org/Freeyourgadget/Gadgetbridge/

The main developer is very open to merging, so there must have been good reasons to not merge - I presume either code quality or requirements for network connection, which Gadgetbridge intentionally does not permit.