Stan, thanks for the idea and the link on the KSD switches. I kinda think that experimenting with these would be way more time consuming than it's worth, so we will just go ahead without for now. If we burn out a smoke unit, well, so be it. Lesson learned. Easy enough to rebuild.
Once installed I will try to get some video of the "sea trials" (well, pond trials really) to share. Should be interesting.
Rod