Honestly, the huge gap between the quiver and my character's back is a serious immersion breaker (even worse than if there were no quiver at all). It's a constant annoyance. Given that there are mods that remove the helmet appearance, this seems like the sort of thing that would be possible.

the gap is there to compensate for clipping, it may be possible to shrink it.

I would like to see this done as well. It doesn't effect me a ton, however, since I rarely use bows on my current character. My next character on the other hand might use them a lot more.

I personally don't like the look of a quiver on the back plus a melee weapon and shield (or two melee weapons). I don't know why. I just don't. So such a mod would be great for me.