Hi normjsr,
I have yet to install any form of "quick-shifter" on a Husaberg.
I have used several options regarding such a device on a variety of motorcycles which include single cylinder offroad and multi cylinder Road Race applications.
The principal is the same as you are simply activating the kill switch circuit via a relay controlled by electronics.
I now make my own system which operates from two tiny 9 Volt Batteries.
Most systems consist of an input swith, kill relay and adjustable time controller. (50 to 100 milliseconds being the norm / adjustable being the best)
Hope this helps.
Kind Regards,
Dale