Looks like ffmpeg (and therefore anything that uses ffmpeg to decode) can be made to support codec2 via an external libcodec2, but the version that is currently in the ubuntu repos doesn't support it.
I don't want to recompile ffmpeg for something so unimportant, so I guess I'm just going to write a bash script to decode and playback without saving.
@ajroach42 👍 #bash, the duct tape of the technically inclined.