Nice pics DJ
I think that the first brand to come out with the idea was Gongsup couple of years ago ;
They now have footstraps boards available in production in his 2008 range ; the guys use them either with 1 or 2 straps
link to the boards (7'7 and 8'10) :
http://www.gongsup.com/-SUP-Straps-.html?lang=fr