I've knocked up 2 profile builder assemblies that use the std Enscape asset bushes to produce unmanicured hedges, there's no random position function in PB but there is random rotation so they do a reasonable job of randomness.
You'll obviously require Mind.Sight.Studio's Profile Builder but I'm guessing a lot of us already have it: https://mindsightstudios.com/profile-builder/
Attached is a zip file containing 2 skp files.
Extract them and place them wherever you store your Profile Builder assemblies.
Feel free to butcher them as you see fit and if you can come up with an improvement / alternative you should post it here.