Call the Bowtech Pro shop. I asked them about making a 4 arrow 2 piece quiver and they said they would do it. I don't recall cost, but it wasn't necessarily cheap.

I will throw in another vote for the Catquiver if you are not married to a bow mounted quiver.

I use a Cat quiver and carry a Kwikee kwick 2 or kwick 3 and use the tree mount in case I need a follow up shot. I too hate a bow mounted quiver.