Training wheels for adults I'm new and just found this site and look forward to being able to contribute where appropriate. 

I am a stroke survivor and trying to do my best to stay in shape despite my limitations. 
I want to return to cycling, but only have the use of one hand, so a conventional bike is not an option. 

Recumbent bikes are of interest to me. 
I recently purchased one and had it modified to allow operation with only the one hand that works. 

All seemed fine until I tried to start riding once again. Even though both my legs work somewhat normally, there is some remaining weakness I have to deal with.  Due to this weakness I've had a very hard time getting started on the bike. My balance is not what it used to be,so getting both feet onto the pedals to get started is turning into a big issue for me.  If I have help by someone holding the bike steady while getting started, I have no issues after that and enjoy the exercise greatly. 

This is not practical since I may not always have help getting started each time. 
So, if was suggested that training wheels might be what I need.  Has anyone ever heard of  or seen training wheels on a full size bike used by an adult?  Or does anyone see any reason why training wheels would not work for me? 

fyi, I have located heavy duty training wheels on Amazon, but before I order them, I thought I'd ask if there might be issues I've overlooked. 

Any help will be appreciated!
Thanks to all in advance!
This sounds like a really bad idea. Training wheels limit your ability to lean into a turn. If you're going fast enough to balance without the training wheels, you're going fast enough that you need to turn by leaning.

So you would need training wheels that retract when you get above ~5 mph, and deploy below that speed. Apparently something like this does exist for motorcycles, but I've never heard of anything like it for bicycles.

The alternative would be to ride a trike.