The suspend-to-idle script is here. Suspend-to-idle cuts power consumption by ~40-60%, where as suspend-to-ram is more like ~90-99% (depends on the device, some might only be 60% reduction). Or you could leave the box on 24/7, it’s only using 2-3W.
It takes the Cube ~5sec to wake from suspend-to-idle with Estuary skin, ~10sec with Arctic Zypher: Reloaded. That’s from CE on a USB, it might be a little faster from an eMMC install. I couldn’t find a way to stop Kodi from restarting after exiting suspend-to-idle, otherwise wakeup would be ~2-3sec regardless of the skin.
The am6+ might have some additional hardware with wakeup function that needs to be turned off so that it doesn’t wake itself from suspend. On the Cube I only had to disable RTC wakeup. Run the script from SSH and see how it performs for you. If you are satisfied then you’d need to remap your skin’s power menu suspend option to the script, or map a button on your remote to it.