Yeah, it would be a ton of work for negative gain. You'd be better off to sell what you have, and put an interesting engine (lean burn Honda? TDI?) into an interesting, lightweight, aerodynamic car (Mazda MX3?)
But to answer one of your questions, when Honda does airbags, the airbag system is totally independent of the rest of the car's wiring. If Suzuki does it the same way, you just leave all the airbag parts in place, and the Swift won't care if it's powered by a 20 mule team, as long as it has a 12V source and the key is in ON, the airbags work fine.
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