Hi,
Unfortunately it isn't possible. The word list is compiled into the game itself (along with all of the associated size/frequency constants), meaning you'd need to either decompile the game (not easy) or have access to the source to switch out the dictionary.
However, the plan is to release the game's source alongside an update around July/August, and that includes the dictionary generation script- meaning recompiles with alternate dictionaries should be possible then. It's still not ideal (setting up the dev environment takes a bit of effort!), so I'm looking into ways to decouple the dictionary from the game's exe for that release. That's all dependent on how much time I have, though.
Thanks for asking!