The 925 gives some interesting possibilities, it is easy to modify to get an RGB output, and in theory you could pick up the digital signal and buffer it and do a digital capture from its internal frame buffer.
The 2950 could be modified to get the composite feed before it is split also.
Worst case you might have to put a drive transistor in to lift it to 75 ohms, but we are talking about just a few dollars.
Of course it then means that you need a capture device with a better comb filter than the one in the laserdisc player to see any benefit.