Thanks for the recommendation. I looked at the various dictionary utilities in dictutil, and it seems like you need to have a fairly high level of technical knowledge about the dictionaries' formats in order to do something useful with it. While I am pretty technical, I don't know much about these formats.
The tool I heard the most about "back in the day" (years ago) when I previously played with this stuff was Penelope. When I looked that up, I found that the project had been retired and Pyglossary was the tool recommended by the Penelope developer. From what I understand, the Penelope code was incorporated into Pyglossary.