Just when I was about ready to have binocs surgically attached to my forehead, I came across http://www.sportbinox.com/ ! An answer to my prayers! Who cares if I look like a techno-nerd, rolling around the desert with space-age looking binoculars strapped to my head! But the site turned out to be obsolete, there seemed to be no way to order the SportBinox. Its probably for the best, as much as I would love to be seen as the geekiest birder on wheels, I likely would have become disoriented and rolled myself right into a tree or off of a pier!
Then I spotted these little gems - Sightrex, another head mounted binoc. But I wasn't sure I had the manual dexterity to handle the focusing of such small binocs, and the power (10x25) was not really ideal for birding. What is recommended is 8 or 10x42.
Finally I came upon SteadyMount, which is very versatile, would provide a multitude of viewing angles, and was a steal at $150 ($130 for the SteadyMount and $20 for the rail clamp)! It can hold binoculars, or a spotting scope, digital camera, or video camera.
I went out and bought some low-end 10x42 Bushnell binocs, and a binocular tripod adapter, put them on the SteadyMount, and attached the SteadyMount to the armrest of my wheelchair. I've been on 2 long guided bird-walks with them, and they work great!
Here's the binocular tripod adapter -