another simple solution is that any good electrician can simply turn off the air bag check light in the odo cluster.
however it means that God Forbid if required Airbags will not reploy.
try getting your orignal air bag kit reprogrammed since it seems ok.
besides one of my car had air bag check light come on due to water in the sensor. i got the sensor cleaned in the front fender and check light error cleared using a scanner and it was resolved. so probably the issue is not with the kit. any of the sensors for air bag deployment may be malfunctioning.