I'm not sure what that's going to look like yet. I have a SWMotech pillion replacement rack, but if I use it directly, I suspect I will need to add some additional support. Otherwise, I may just fab a plate from scratch. I'll know more when I physically have the tank in my hands.
It's easy to run bolts through the SW rack to the subframe where the grab bars bolt. Just get some spacers from McMaster and that plate will be rock solid and still easy to remove when desired.