Maybe I'll dig out the recipes I got in my nursing school days in ND. One of them used instant mashed potatoes if I remember correctly. Of course, I don't have an electric lefse griddle or wooden turner but the old cast iron skillet might work.
A cast iron skillet will work just fine, just get it good and hot. A Swedish friend of mine uses a iron skillet. I set my elec. plate at the highest setting (I think it's 450 to 500 degrees. The numbers wore off years ago. LOL You can use a wooden yardstick as a turner/flipper. I know some folks have made lefse with a regular rolling pin, but a lefse rolling pin works much better and much faster.
A Norwegian tourist goes to Chicago, and an Italian decides to take him to a pizza joint.
The Norse takes one look at the counter and says, "Who trew up on da Lefse??"
I sent you the recipe I use in your FReep mail. :)