A possible work around would be to edit the waypoint file that is saved on Android devices. Root is not necessary. Just use a file explorer and navigate to explorer/mission to find your waypoint file. You can use a editing App like QuickEdit to edit your Alt.
Not sure if this would work but it is something we do in the Anafi App to get a negative Alt. and it works fine.
So where it says Altitude and gives you a value this is the number you would change to a negative number like "-10"
This if it does work will make your EVO drop down to 10 feet below your take off point.
Doing negative numbers you really need to be careful of whats around you.
Disclaimer
This has not been tested by me or anyone that I know of for the EVO so test at your own risk.
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