There's Thornton Pickard focal plane shutters that will go to 1/000th but they are hard to find these days and expensive if in working order, they were the first Roller blind shutters. I have quite a number of smaller TP shutters (I reduild & restore them) that fit on the front of a lens or to a lensboard but the top speed is normally 1/90th, there were much faster versions but essentially instead of a full slit they used a narrow slit.

Personally I'd just use a Speed Graphic as fotch suggests. However there were a number of add-on Focal Plane shutter backs made to adapt cameras you might just strike lucky and find one.