Bacon taste booster gives you more of an old-world flavor when using modern curing methods, so using 1/3 of what you would normally use isn’t going to cause you any real issues, it might just not taste as strong and bold as you are used to. I am not aware of anything you could use that would replace this additive. If you were looking for a way to increase the taste you might consider rubbing the outside of the belly with something, like your favorite rub, or dehydrated jalapenos before smoking it!