RE: Double footstraps-still available?
In the mean time, while waiting for a wide footstrap, just take a normal footstrap and mount it diagonally, as a pseudo-symmetric backstrap. For example from the right front backstrap hole to teh left rear screw hole.
It actually works very much like a slightly wider strap, but you still get the grip that a single strap offers. Sounds ridiculous, looks crazy. Try it, and report on your findings!
I have used a setup like this for two seasons now and I like it.