Button Launcher

Create shortcut combos (remap buttons) on Wear OS

Button Launcher is a completely free software for Wear OS that allows you to define what apps will be launched based on up to two button press combination.

For watches with only single (primary/home) button, there are only two shortcuts to set. The first is just long press that primary button followed with no other button press (within a configured timeout), the second are two long presses of primary button in a row.

Watches like Huawei Watch 2 with 2 hardware buttons allow for 8 different shortcuts.

More info: https://forum.xda-developers.com/android-wear/development/app-button-launcher-button-shortcuts-t3757005