Dave, I have Photoshop 6, the last copy you could actually buy and own, and may go that route. You're right, the tif route should be workable if Iridient doesn't provide a "one stop shopping" solution which is what I yearn for!
Andrea, yes, CNX2 was working until a month ago on Sierra when I pulled my stunt with the uninstall. After that, it was only a memory. As I told Dave above, some form of tif transformation should work. As for the 810, awesome is the perfect description. I was stunned when I saw the clarity of live view - wowee zowee! And the shutter sound is so pleasing to hear. Plus a lot of other good stuff...
Thanks you both for your suggestions, they are good and much appreciated. I now see a path to a solution. It helps to talk about it, that's a 100% certainty.
Cheers,
Tom