In the Yoke type 1st stages, if you suspect that water could enter even with the dust cup in it's position, then, what about using a small piece of rubber, cut from a tire inner tube just between the dust cup and the 1st stage openning ?
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Yup. The BCD power inflater has a male post that, when attached, presses on and opens the Schrader valve (located inside the end of the LP inflater hose). FYI, you can visualize the Schrader valve if you shine a light into the end of that hose.It's fine, the LP inflator hose is only 'open' when connected to the inflator.