Not sure whether the they make a long haul seat or not for the Roadster, I just got it on my Touring and it is not too bad. Love the back support.
Others have Corbins the like.
And you could try a sheepskin pad for more softness. The long haul is pretty firm and I have been thinking about the sheepskin pad.
You will most likely get some more suggestions.
Rick
Wish I had known you. Been wanting to head up to the UP, but have not found someone else to go. Two of my riding buddies are too busy and one is still recovering from a motorcycle accident last year.