its amazing all the stuff that's coming out to help people with all kinds of tech get 3D over a projector. Tru3D Now has a HDMI to VGA converter box for 3D. Now with the TRU3D, I'm not sure if it's a stand alone device or you have to buy it then buy like the optoma 3DXL.
Also, there is a product called HDFury4, i believe, that right out of the box hooks to a VGA only projector and is ready for a external 3D blue ray HDMI only port, or whatever. On the down side they will both set you back almost $400. What seems to surprise me the most though, is the amount of people who DON'T !! know about these products. I would expect more people on these forums to know about these products then what already do.. People say flat out, "They don't" when in fact they are dead wrong, lol. But i understand. Most of the community on the AVS 3D section don't deal with the VGA stuff. So, it's cool. I have a viewsonic pjd6211 projector with only a VGA but will be using Nvidia 3D vision.. I would have to admit though. Instead of forking out $300 dollars for these adapters, It would probably be cheaper just to sell the projector you have then take the $300 and put it to a projector that at least has an HDMI 1.3 port then go from there.