Buy an ex-oscilloscope camera Ilex #3 Universal shutter. These are often offered on eBay. Clean and adjust it. Don't lubricate, they are made to run dry. Hold it in front of your TLR's taking lens. Fire the TLR's shutter on "B" with a locking cable release. Then fire the Ilex. Then close the TLR's shutter.
Originally Posted by BlueWind
I've just looked at my crappy old Lubitel 2, this should be possible but not much fun.
But on the whole you'd be better off with a better camera that had a fully-speeded shutter.