I bought a RRS panning clamp that has a built-in Arca Swiss compatible dovetail base. So you can attach this panning clamp to the BH-55 without having to change anything on the BH-55. You can then use the ball head to level the panning clamp. Simpler, I think, but I suppose more expensive.
https://www.reallyrightstuff.com/pc-lr
I also use a leveling base (with a dovetail bracket on the bottom) between the BH-55 and my tripod at times. I have clamps on the tripod and leveling base to make adding the leveling base or taking it off easier and quicker.