I recapped a couple of PB Duo, it is not that hard. I used a soldering pencil with a tiny tip,  no hot air required.

The best way to go is SMD electrolytic, if possible smaller in diameter, they make the job easier

Remember that the Duo MiniDock is also filled with the same kind of caps



This was my first recapped Duo 230 Logic Board

Also, if I remember correctly, the caps are the same type as the ones you find inside an early SE/30.