In short, no. You can’t use the PDP because orange pis take 5V, you shouldn’t use the VRM because they can pull more than 2A. You can use a battery bank (make sure it has enough current) or a DC-DC regulator (make sure it’s rated for 12V down to brown out voltage levels).
There’s been a couple different threads on the topic so the search bar is your friend here, I think this is the most popular thread: https://www.chiefdelphi.com/t/powering-an-orange-pi-5/451958