OK, after much hunting and telephone calling and driving, I located Swerve Sweetener (powdered and granulated). I didn't realize that Swerve isn't an artificial sweetener. (I should have realized this, being as how the only place I could find it was Natural Foods.) I learn something new every day!
I have completed steps one and two, and my almost-Nanaimo Bars are hardening in the fridge. OMG, the middle layer is to die for (I licked the spoon)! Just 30 more minutes in the fridge, then I melt the sugar-free (natural) dark chocolate with a hunk o' butter and spread the third layer on top. Then it's back in the fridge for awhile. I think I'll take a pic while they're still in the pan because I'm afraid I'm going to mess them up when I cut them into squares. But if I don't, I'll take a pic of them cut into squares (actually rectangles because the recipe makes 20, the pan is square, and I'll cut them in rows and columns of 4 and 5, respectively).
I haven't been this excited about food in a long time!