I don't suppose, using the GECK or Nifskope or a combination of the two, there's a way for me to put the 9mm and 10mm SMGs on the back, but maintain their one-handed animation/functionality when in use?

I tried changing the weapon animations in GECK (I think I changed it to 2h auto), and indeed the weapon was stored on the back, but the firing animation looked really bad with the character's right hand way too far up, almost encircling the muzzle flash area.

Having that 9mm SMG attached to my character's leg just looks really stupid to me, and I think it looks better on the back. But I'm doubtful that it can be changed without the bad firing animation I mentioned. Any ideas?