Why don't you just use button mapper to map the Bixby button to long press flashlight? Works with root instead of bxactions where you gotta adb.If this rom had circle battery option and long-press power for flashlight with the screen off it would be so perfect.
I know I can do both with edxposed and gravitybox (p) but would prefer not to use those if I don't need to. Works fine for now tho. Rom is performing really well in terms of battery and smoothness with the latest magisk v19.