regarding the airbag light it wont matter which boss you use, but you can fit a resitor in there or just take the light out.
the indicators should cancels as long as you keep the little ring aligned behind the steering wheel no idea what its called.
as for bosses probly best to spend a little extra and see if the traders on here have them.
i used a civic boss with no troubles, but of course reccomend buying one made for starlet hope it helps