You can substitute bacon for the pancetta, but since bacon is smoked, your final product will taste significantly different.
Any decent Italian market should carry the oil-packed Calabrian chilies, but if that doesn't work, you can find them online as well. Or use another spicy, jarred pepper product like sambal, or simply use fresh hot chilies like Fresno, or cherry peppers. If it's spicy, and it's a pepper, it will work.
I used soppressata and Calabrese salami, though any salami will work here.