I think you' d be better off with a set of collapsible shooting sticks, that way you can adjust for whatever height you need, pretty rapidly. Also, The Sportsman' s Guide has a Expedition Staff that extends from 35" to 65" tall and doubles as a walking stick for only $29.95. I not have seen a barrel clamp bipod lately that will adjust for high enough for sitting shots.

Remember also, barrel clamp bipods, or even resting the barrel on shooting sticks
will affect point of impact.