Thanks for the suggestion. I've thought about using a regular pan head with markings, but I don't want to spend the time to re-align and it might be off a bit from my previous shots. I wonder if there are any with some kind of way to quickly return to an existing setting? Typically I would do something like a 2x1 vertical pano where I shoot the foreground and then tilt my camera up to get more sky and then return to the foreground.
I also have a full pano head (RRS PG-01) and I could put a nodal ninja indexed rotator on the vertical arm, but it would be a bit cumbersome and heavy to always carry around.