Richard,
If your only reason is to allow fuel filter change w/o worrying about stopping flow of fuel from the fuel tank why don't you keep it simple and do what I did (see pics of my left sponsoon) and just make the line in and out of the filter long enough so the filter and lines can be raised out and above the sponsoon and above the fuel tank top and you won't need the valve. If you do it your way you will still have leaked fuel from lines downstream of the fuel tank anyway, my way all those lines stay filled and very little gas lost.
I also recommend a large Canton filter as in my pics (better filtering and lot's of capacity).
BTW...I don't have any problems with filters plugging up now 3,000 miles. Did replace filter element at 1,000 miles just in case and all is well.
Steve P2125