I posted some videos of Ron Moore deploying airbags on several different Ford vehicles at the CREST Center in Michigan. Ron hot wired every airbag in the vehicle and deployed each one. The Ford representative was there also, he had an airbag wired up to fancy box with a button. Ron used a battery! The Ford guy did throw out a disclaimer that Ron’s method is not endorsed by Ford.
You should never preform extrication training with a vehicle that has live airbags. Use the opportunity to demonstrate to your department what an airbag sounds and looks like. This can also help on the EMS side of things to understand the speed and the size of the airbags. Here are some step by step instruction how to hot wire airbags. Other useful info available at Firstrespondertv.com.