Here locally some have used the below schematics with Gen1 hayabusas to enable 10% fuel enrichment for nitrous without additional devices. Looked around and added the Kawasaki colours in this so that we can test if this works on a kawi too.

Basically what happens here is that the ecu gets a 10% enrichment signal from grounding the COS1. So connecting a relay that activates this circuit in parallel with nitrous solenoid this could/should work on kawis and most suzukis too.

Planning to test this, but if anyone else is faster - please report back.