I would think an electric plane in the "park flyer" size and weight would be something to consider if you don't have access to a larger area.

The reasons are
- much smaller mass (weight) .The actual size doesn't matter from a safety viewpoint. The mass to do damage upon impact is what matters.

- The ability to turn off the motor & stop the prop turning would reduce damage upon impact.

Also there are some very aerobatic electric planes available - esp with the improvements in battery technology.

You still would have to be a pilot accomplished enough to keep it under "control". I'm not sure I would be good enough to try that. I know I can't bring myself to attempt it at our local school yard and it sounds about the same size as you're referring to.

Eddie