It’s really tough to compete with Amazon..they don’t share the buy box like any other seller would. The bundles sound like a good plan. Maybe try running an auto campaign for a couple bucks a day and see how it goes. Good luck!
PPC won’t hurt, it’ll help you out and show your products to more customers. It’ll be a nice way of giving your new bundles/PL a boost then once you get the ball rolling, you can turn it off or reduce the budget on it.