I can't agree with you more about the brutality of Kymco seats.
(no fat jokes here - i'm within about 5 pounds of you)
Always wondered about the gel cushions and appreciate your comments.
Down in the Yager section i posted a photo how-to on butchering the Yager's seat, adding a sheepskin cushion, and just living with it.
It's been several hundred miles since i did that and my butt complains quite a bit less, but it still isn't a LazyBoy. Maybe a gel pad under the sheepskin? Dunno, might be worth a try.