I was thinking the same thing Dianyla: get Velcro straps and "extend" the existing straps to work on your bike. Of course, that would make the ride a lot more boring than if it was by the seat!
Especially if there's an SO involved with helping you look for that snack!
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"