The problem is to find small carbs for a good price, but the Enya 09 carb is a very good place to start. If you don't have a lathe to reduce the shank diameter you can also drill or ream out intake a little. I did that on a Philtech Diesel and it worked well. The Enya 09 carb is also a direct drop-in on the PAW 09 diesel.
https://www.youtube.com/watch?v=E_PRqDNAsDs