06ranger, I don't know if you've found something suitable since your last posts.
If you already use a Fobus holster and are happy with it, Fobus make a drop-leg rig for use with their roto-holster range.
If you got the roto-holster appropriate for your pistol (if you're not already using a roto-holster) and the drop-leg rig it might suit you.
I use one and find it suits me. Holds the pistol securely within easy reach on my thigh and it's very stable provided the thigh strap is properly adjusted and the belt loop is properly secured - belt keepers may be required to stop it sliding around the waist.
If it gets covered in mud it's easily washed off and dried.
Works for me, may not work for you.