Answers
"Does anyone know how to get playing indices that correspond to Canfield's Master Count?"
Sure. Canfield's Master Count is Carlson's Advanced Omega II Count. There are many indices in Bryce's book Blackjack for Blood.
Alternatively, software such as CVData will generate the indices.
Finally, in BJRM 2002, the Counting Systems 101 section will give you the I18 and Fab 4 for AO2.
Don