*assuming it is legal in your country to remove the airbag*
Your best bet for what boss kit will work would be to talk to a Micra owner in the united kingdom who has removed their airbag steering wheel and replced with a non airbag wheel. the boss may be different.
as for the light, the easiest thing i can think of is to just remove the airbag light. Dodgey, but i think its the only way other than going through the loom and disconnecting all airbag sensors and associated elctronics from the vehicle.
cheers