When I was poor I also did just plain mayo sandwiches, also tang or sugar sandwiches.

I do PB&Banana, PB&Bacon with Jam or banana, but have never done banana&mayo.

1 out of 10 will still try.

After mentioning the combos above I'm thinking PB&Jalapeños or spicy Jelly may be a good idea. With bacon. Mmmmm mmmm