Here are some links (thanks again, Robin!) to posts about methods of starting iris seeds - there are no doubt more, but these are ones I starred:
Paul
https://garden.org/thread/view...
Brad
https://garden.org/thread/view...
Jan (tea method link)
https://garden.org/thread/view...
If you know of other methods and would like to share...
I think I might experiment and see which works best here - in the past I just sowed the seeds and left them out over winter, but if I can speed things up, why not?