Mike,
I had exactly the same question recently. Plus, I want to mount my binoculars and astronomical telescope (as a fair-weather spotting scope) as well. Did quite bit of investigation and came up with a solution that meets my own very varied day-time needs for travel photography, sight-seeing, hiking and birding (Not a full solution for night-time star gazing). I posted my finding in another thread under the following title in the same "Tripod/heads" forum.
Best wishes!
Haibo
Can gimbal heads (such as ProMediaGear GK Jr.) be used effectively for bino, spotting, telescope and camera