what sport profile for water running

When I am injured, I often resort to water running - using a purpose-designed floatation belt that positions you upright in the water while you 'run' in the water.  I created a 'water running' sport profile from the 'treadmill' profile, but most metrics are pretty far from expectation b/c I'm running in water and not on the treadmill - cadence is slower, distance is weird, other metrics are not right.  Is there a better sport profile to use?  Are there other Garmin devices with this profile built in (maybe the Garmin Swim series)?