Greetings, nratc, and welcome to MLMF. I don't know how comfortable the seat would be during operation, but I found the Cub Cadet ZTR seats very comfortable. I have a back that gives me trouble. If I ever buy a ZTR it will be more for the comfort of the seat than anything else, I think. Just for fun I was test sitting on some on a sales floor and the Cub seat was comfortable and supported my back better than any others to date.
I see you are from Ohio. If you have a TSC or a Farm and Fleet in your area, check out the replacement seats. You should be able to get a seat made for comfort for a full sized tractor that might just fix you up! Might make it an hour between breaks!