Well, it's in and done! - Only modification to the car is that I drilled a 1/4 inch hole on the bottom of the cup holder so I could both the two together
First, I cur the 'plug' off the armrest - Figured I'd rather screw up a $38 aftermarket part than a piece of the car. After I cut the plug off, I reinserted it from the inside, but it didn't go down far enough to engage the cup holder to be solid, so I sanded the inside of the new hole in the armrest until the plug stuck out enough to make a tight fit in the iMiEV's cup holder. Drilled a hole in the center of the plug, put about a 2 1/2 inch 1/4/20 bolt through both pieces and tightened them together. I did use a monster fender washer under the cup holder to keep from breaking it when I torqued everything down. I have before and after pictures, but no way to post them
It sits about 1 1/4 inches lower now than before and it is SOLID - No wobbling in any direction. IMO. it's still a tad bit too high for absolute comfort, but it's much, much better than before. I'm guessing there is also an elevation difference between our cup holder and the one in the Yaris so it very probably does sit lower in a Yaris, but it's now low enough to be usable
Looks stock - I doubt we'll ever take it out of the car, so I didn't worry too much about having to drill the hole. A very nice $38 addition to the car!
Don