'Learned this method from an another X owner, it is just too simple and works wonderfully, .....
I have a dedicated boat pole for use in opening and closing the ballast gate valve at the stern. Shortened a bit, but still able to be used for a regular boat pole when needed ..... it is kept clamped to the transom beside the motor, close to the valve, and easily reached from the helm seat without bending down over the transom or having to lift the seat at all. Just unclip the pole, and use it to pull on the standard valve T handle to open, or push it back down to close it.
It has a plastic end, and I cut and sanded most of the point off, leaving a small shoulder and the outside flat of the hook to give a good bearing surface for pushing the T handle down to close it, and use the hook to lift the handle up to open.
Seems .... obvious .... no need to rig up complicated mods or spend alot of time/money on this easy solution.
(No, the photo is not reversed, if you noticed the hinge on the helm seat.... I moved the hinge to the starboard side to allow better access thru the transom on the ladder & port side. And the backstay had to be moved to the port side also... )
THe pole is tethered with a stainless steel hardware clasp, so it can be removed easily, yet be secured from falling in the water accidently.