While this isn't a slipper clutch, there are settings in the ECU for engine braking, per gear, and per S or T mode. 14 tables total, including neutral in each mode. With the Flash-Tune software, these settings are all there for you to play with. You will have to invent the wheel here.
I bring this method up, recalling a conversation I had last year with an AMA roadrace team crew chief. He was telling my how he much time he spends dialing different engine braking for each gear, for each rider on his team. Each rider liked different amounts. When I asked him about the slipper clutch, he said, "well I can only set that up correctly for one gear, it will be wrong for all the other gears". He changed the settings in the ECU for the others gears, to get exactly what each rider wanted.
This option is available today; a slipper clutch, I don't know if it is available.