I’ve got it built now and done some testing - not found any problems so far, it looks very good.
With this improvement I thought it worth updating the Nyquist Generate Prompt so that it will support multiple expressions (it didn’t seem worth the effort previously because of the other limitations that you have now fixed). https://forum.audacityteam.org/t/nyquist-wish-list-nyquist-prompt-enhancement/16379/6