FWIW
If I were you, I wouldn't waste my time and money on getting a degree. If you've had that much experience in various fields it should be relatively easy to find a way into the robotics industry.
Plus, if you have the money and the time to "validate" yourself by going through the monotony of classes which sound like they would already be well beneath your level, I would say you would be better off by putting that money and time toward your own robotics company.
It sounds like you have more than enough initiative to accomplish the tasks you set out on. Why waste time getting a worthless piece of paper to show your level of worth? Just to work for a company that can't understand the value of someone beyond what they see on paper?
Think up the next wave of robotics you'd like to see in this world. Then do whatever it takes to make it a reality.
Build a company to work for if you can't find one that will hire you from your background alone.
Now. ;)