Simple Switching between Android and CoreElec?

Hello, is there an easy way to switch between Android and CE without restarting the Odroid N2?
Possibly with the assignment of 2 keys where a script for starting the respective system is stored.
Or there is a way to install a button for “Start Android” in the off menu and install a button for CE start in Android 9.
At the moment I use Petitboot with CE on USB 3.0 Stick and Android 9 on mSD.