If you are in whitewater, I would be wary of any plan that relied on
unleashing straps long enough to present an entanglement problem. In flat
water (if I understand your idea correctly) the entanglement risk would be
less of a concern.

Whether it actually would work is a matter of the actual mechanics of your
lash-up. You probably will have to wait until you can actually try it.

For what it's worth.

Rich Phillips