Leonard, where are you at in So Cal? I know several shops that could install a tab on the back of your boat for ya, no problemo.
Hell if you wanted to get super tricky with it, and do something (gasp) custom, they can do that too!
Fatsac, it's already being done on just about every performance V-Drive ever built. you recess a plate into the bottom of the boat (called a cavitation plate) and it's a seamless transition from the hull to the plate. The plate then sticks out past the back of the boat to some length.. Usually pretty short anywhere from 8 - 12 inches. (Although some are longer) Instead of the plate being "hinged" it actually bends. By having the water transition on to the plates smoothly the plate is now an extension of the boat. By bending them you can in fact add "hook" to the bottom of the boat. You only have to bend a cav plate a small amount to make a HUGE difference in trim. The other trick thing about it is, if you bend it up you can add possitive trim to the boat, in essence adding what's known as "rocker" to the bottom of the boat. This will allow the boat to free up a little more of the bow and transfer some of the weight back onto the plate.
You don't have to recess necesarrily into the bottom of the boat to make this happen. You can do a plate off the transom, so long as it's a perfectly smooth transition from the boat to the plate. As long as the plate it "bending" instead of dragging through the water you'll get the same benefits.
To be honest with wakeboard boats heritage basically coming from Inboard ski boats, and their heritage basically coming from Jersey Skiff's, and Cracker Boxes I'm surprised nobody has made the connection yet.
The center tab is cool, but it does limit the control, and adds alot more drag in the water, then a little Cav Plate would.
Some pics of Cav Plates for you. I wouldn't do one all the way across the back of the boat though. I'd think a small one in the middle kinda similar to their current tab setups would work pretty well. Of course your going to have to pay someone to build it for you, but I think you might find, an electric Cav Plate, vs how much some of these people are getting for that hydraulic tab.. the price not be that far off between the two.