<i>I once got to go to a pidyon that a man made for himself.</i>
We did something similar. When we performed a pidyon for our son, a friend of a friend of a friend who came from Russia who was a firstborn and *possibly* needed a pidyon asked if he could “borrow” our kohen and ceremony for himself as well. He did the pidyon for himself (without the bracha) right after we did our son’s pidyon.
The Wolf