Regarding the LCD problem: Don't you simply have to align the signal sent to the glasses with the LCD frames? You don't need the full delay, as the switching is rhythmic, so you only need up to 1 frame, or 1/30th of a second. I imagine it shouldn't be too hard to build an analogue device with a knob to control the delay, after which you just turn it to whatever position shows the appropriate image for each eye.
I think you'd need up to 2 frames. Up to 1 frame lets you line up to the vblank more or less, and the 2nd frame lets you pick which eye. Might be able to do it with an adjustment for the delay and a switch to toggle the eyes.
Edit: if you happen to have a 3d tv still, it might be possible to tell it you've got frame sequential 3d content and then use its glasses. Possibly.
