One other thought...

It's pretty easy to get a used single-cylinder 2-stroke engine that'll haul the U-Can quite well for way way under a hundred dollars... and of course such things are usually reusable, like if you were to put together a pure trainer for the wife. You might want to consider picking one up for the U-Can-Do because the value of your airplane is way way less than the value of your twin-cylinder four-stroke engine... so using a good inexpensive engine will protect you from the worst loss in case of a bad landing or other mishap.