@Yorkie88 It appears this works with the Sony A6700 in a Nauticam housing. One of our members @boduoguo has a picture of his set up in a thread about the Sony A6700.
If you're in a hurry to turn off strobes, you might just pull the fiber optic cable. Usually I have enough time to turn off both if you're thinking about shooting existing light.
As others have noted, a luggage scale and a large bucket is de rigueur. If you're interested in Stix floats on ULCS type arms, the "jumbo" floats are 181g, and the "large" floats are 96g each. They look cheap in photos, but they're durable and infinitely adjustable. And you might need buoyancy for the macro port if you add a flip diopter holder.