Well after doing some research, I'm doubtful the problem is solvable for standard tours. "You need to create an html popup to start."
Also, there is no keyboard focus without a mouse click, so if someone didn't have a mouse, they'd wouldn't be able to do squat. Theoretically, you could program keyboard inputs to navigate a tour without a mouse, but you have to get it to respond to the keyboard in the first place!
and of course I find a partial solution as soon as I post..
working for keyboards
http://dougr.net/2011/07/05/automaticall…f-object-focus/
Perhaps this should be wrapped into the embed js.