I can see Pete's point. NOS is injected separately from the primary fuel and is not allowed so following that guideline injecting water/methonal separately would be identical and if treated the same, not allowed.
But as DW and Stan note, will it really matter once I get through tech inspection? The tank, pump, etc can be hidden away out of sight of the inspectors and given that, will it really matter? The W/M mix is not flammable by itself and is not a safety concern in the mix ratio of 51 water/49 methanol. It makes a great windshield washer fluid at that ratio, too.
But now that everyone knows about it in a public forum, the tech guys will probably be lookinng for me come September!