If anything, the overall flavor profile of ABTs in my opinion is always the salty bacon. But leave seeds or veins in and they'll be hot.
Make a tiny batch, say just 4 of them right now and ask a volunteer to eat it. You want confidence, not guesswork come the Big Day. If your volunteer raves about it you'll know to proceed. If your volunteer isn't ready for the adventurousness of ABTs (spicy hot or not ...) then skip them altogether at the get together. Not everyone freaks out on ABTs.
Simple is the rule here and prep them the night before. It's tedious and you'll want to be doing other stuff the day of the cook.
That said, sweet peppers should be really good as well, just don't fill them with something too sweet.