@RJG1300 -- a trike kit may seem to be the answer, but it may not be once you look into it more. I think I'd do some research on some Harley forums to see what they say about the pros and cons of a trike mod to a motorcycle first. You wouldn't have to join the forum, just do a search.
I've read some things in the past about how trikes aren't all they are cracked up to be. (Note, I've never driven one.) The con that sticks in my mind is how they handle. On a motorcycle, the front wheel and rear wheel track on the same line pretty much. What your front wheel encounters will be followed up with the rear wheel in a moment. But with any three-wheeled vehicle, you have three wheels all encountering a different portion of the road. With a single front wheel, I believe they were saying the trike is difficult to steer as it follows whatever camber the road has. With the rear wheel providing only propulsion, the front wheels do the steering and the rear wheel follows along wherever those front wheels point. It might be why the Can-Am's went to the dual front wheel setup, and why other three-wheeled vehicles like the Yamaha Niken does the same.
How about a safety training where they practice to feather the clutch while controlling speed by gentle use of rear brake, plus avoid looking down at the front wheel but in the intended direction instead
This might be the best solution. You'd pay a lot less to get some professional training than to buy a trike modification kit and hope it works. The tip over wings on the ST will keep you from damaging the bike pretty much and you'd get the confidence back to do the slow speed riding without falling.
After my drop(s), I finally decided to do some parking lot practice. I'd been putting it off since I don't have a problem going fast. What I finally realized was the skills I learned in the Advanced Rider's Course to get my motorcycle endorsement had deteriorated badly. So I started doing some easy stuff in some parking lots till I finally got my comfort level and confidence back. Again, it is all mental. Just like a golfer can have a fantastic game one day, and a completely lousy game another day. Same clubs. Same course. Same person swinging those clubs. It's all in the mind.
And if your wife says it'll have to wait till next year...what are you going to do? Make your bike a garage queen and not ride it? Nah, you can do this and keep on riding.
On the other hand...you can buy a Miata and still enjoy yourself!
Chris