Speed graphic is how I do it.
Me too. Though before I bought that, I thought about building a guillotine shutter. It's basically a shutter that uses gravity to pull the shutter for consistent timing, and you can vary the timing by adjusting the width of the slit. It's just a light tight box in the front of the lens with a groove that the shutter rides in. The shutter itself is a long board with a slit cut out in the middle. When it's all the way up, it blocks all of the light from reaching the lens. Then you drop it, the slit passes over the lens, and lets in a controlled amount of light, then the top of the board completely blocks the lens again. It's not a perfect mechanism, as it's hard to get it light tight while keeping it loose enough for gravity to pull it through. And gravity accelerates objects, which means the top will get slightly more exposure than the bottom. But it can still work pretty well, and is something simple enough that you could DIY out of wood or plastic.
In the end, the Speed Graphic made more sense to me, as it was also a lot easier to carry around than my Sinar F1. It triples as my field camera, barrel lens camera, and hand-held large format camera.
I now have a broken Compound 3 shutter that I could use for a barrel lens shutter. The mainspring is bad, so it only works in B or T mode, and it's got a pretty wide aperture (also the aperture blades have been removed). I used it to scavenge parts off of for some of my other Compound 3 shutters (I have several antique lenses). I haven't tried it yet in that capacity, as the Speed Graphic's focal plane shutter does an excellent job. But it is an option that I could consider if needed. So something like that could be a consideration, though you'd need to figure a way to mount it.