I don’t decap in the same step so I just removed the pin. That said, if you have access to a shop, you can ask the tool makers to reduce the pin diameter in a Monoset (cutter grind) or with lots of patients do it yourself.
An idea I have not tried is to ask Lee if they will do this for you. They have made custom diameter mandrels for me in the past, so it should be no big deal for them to sell you a new mandrel and reduce the pin diameter. I would ask them and see.