In the meantime Rusty is in a perfect position to begin this testing. He has his engine rebuilt but not yet reinstalled? He also happens to have 2 DC EWP's. And he lives down in the banana belt. 

Well, the RV-3 engine is installed, and I hope to have it running this weekend.  I am in the perfect position to test this though, since I have my EWP running in series with the mechanical pump.  I have in fact tested this on the ground, by removing the single belt that runs the mechanical pump, and alternator.   Even for a short flight, I'm uncomfortable with the thought of taking off with no alternator.  During my break-in time, I plan to measure currents required, and also verify the length of time that the engine will run with no alternator.  Perhaps I'll be willing to make a short flight based on those results.  No promises though.  My wife would not be as understanding about a 2nd dead stick landing.     

 My only concern would be that I believe Rusty already has one of the Mezeire adapter plates and would likely just use this. I agree that it is a nice piece of work, but it looks (from the pic) a little restrictive (no, lets not get into the restriction topic again:-). I built my own to allow the use of 1.25" hose for inlet & outlet. Since Rusty has recently demonstrated his ability to fabricate items such as this, it should be an easy task. 

No fabrication required.  The latest Meziere adapter has two AN-16 straight thread o-ring ports, which have a 1" ID.  I have two fittings that convert this to 1.25" hose nipples, which is the same as the native Davies Craig fitting.  I have these items for use on the single rotor engine though.  Eliminating the water pump housing on the RV-3 engine would involve more work than I care to do at the moment, but I will at some point get around to doing that.  Maybe when the e-shaft alternator rolls around.