Garey,
I did about the same thing a couple years ago. I had a problem with mine, which was the grapple hydraulics, did not have near the holding pressure it had when operated off the rear hydraulics.
I could never find a brand name on my valve, but the invoice was written up as MS06-UDNA-01-12B Selector valve, 6 port, 6 SAE, 12V. The included instruction said it would have a certain amount of leak by, but it didn't have the same pressures, even while the valve was energize.
This valve was only energized when the button was held in. My supplier wanted to exchange it for a valve that had to have a solonide energized at all times, but I didn't like that idea and asked for my money back.
I would really like the idea of not having to move my hand from joy stick to rear remotes, if it would work the same otherwise.
Just wondered how yours worked along these lines