I'm not sure you'd make it thru customs with a Bear Banger kit :-/
I'd check before trying.
With the security situation nowadays you don't know for sure what will or won't trigger a alarm.
Anything that has explosive properties for signaling or not, MIGHT set a overzealous border agent into action.
I bet you could use some braided fishing line and that Bear Banger IF legal to rig a tripwire to protect your food source or alert you to one outside your tent.
Like MT says, not all bears will respond the same to loud noises.
I have my personal bear alarm which I rig to protect a food pack on long portage but I see it as more of a warning device than something that will scare a bear away 100% of the time.
It would be great if it did but my go to item is the Bear Spray. Having a early warning so I can get it in hand especially if I'm in the tent is  a big plus in my book.