Why wouldn't you use a seat belt just out of curiousity? Anyways almost all buckles are going to have that top release lever or a push down release option. It almost sounds like you might be better suited to use the Ride Barrell Roll Ratchet as its pressure released, while crappy for a snowboard binding practicality, for what you're doing it might work perfectly.
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Because someone has to call it how they see it!