Hey, Pat. Long time no hear. Are you happy with the Truimph? Looks niiiiiice.
I have used the string type quite successfully for myself and also on other people's bikes with no issues.
There is a mushroom type that you have to remove the tire, insert the stem through the hole, glue the head to the inside of the tire and then cut off the portion protruding on the outside. Why not temporarily use the string, or plugger and then make a more permanent fix using some other method?
Those photos of you plugging the tire are great, why not post them here as well.