Can I use adb to change the default launcher program?

you can remove (Uninstall) the default program you set using ADB by doing this :

adb uninstall app.package  ..... //for example (com.example.homeapp)

If you don't want to remove the app .. here is a quick hack to do it:

That way you will have a picker with all apps on your devices that listens to Main Action

Choose any home screen app you want . then go to settings and set it as default.

adb shell cmd package set-home-activity "package/activity"

adb reboot

For system apps you can't uninstall, use pm disable as in

adb shell pm disable com.android.launcher

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