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I believe there is a threaded portion on the bottom for mounting. You can probably get an eye bolt that size and then either a standard bolt snap with a quick-link, or just a double-ender.
Almost all U/W cameras are held to almost all trays by a simple 1/4-20 bolt. I don't see the problem! D-RingsYeah, I thought about it. Doesn't sound terribly secure though. With permanent threadlocker perhaps.