I was able to open up my iris by drilling out the pins by hand with a small drill bit in a pin vise. At first I thought I would be able to drill from the back and pop out the pin with a dental pick but that didn’t work - later after I had drilled them from the outside the one I’d started on from the back did pop out… but I don’t think it’s necessary if you can get the pin vise bit to center right on the steel pin. Then you just have to gently scoot the backing ring out, alternating pressure on opposite sides (gently so as to not deform the housing).
To reassemble I used angled tweezers to help align the pins into their slots/holes. And I was able to polish it quickly with just a little scotchbrite and a quick pass on a buff wheel with rouge
Getting the blades back in the right place to function properly was a bit of a puzzle. There are 5 identical blades for the top, and 5 more (mirrored) for the bottom.
The inner rotating ring also has a blade on each side, each of which has two pins right next to each other. These fixed blades do not move inwards with the others and are instead meant to keep the first blade from catching the end of the 5th blade as the iris closes.