Here are the previously promised photos of Mike’s homemade seat rack.
It’s a little hard to tell but the rack is actually inserted into the seat itself.
When I want to use this seat, I just swap it on for the stock one. The only additional step is to add the black zip tie that you can see in the middle of the rail under the rack — that holds the rack down onto the grab rail. When I swap the seats back, I just cut off that zip tie.
Here’s what the bike looks like with just the seat rack and no bag: