Are there any strobes that have a light output duration of 1/24 sec? I don't know of any electronic single-pulse system like that. Of course there are high-speed multiflash modes that go for much longer, but that's going to produce thin horizontal bars in the image, if I understand how the shutter works. To get real continuous light for 1/24 sec I'm thinking you might have to go old-school, like pyro - flash powder.
If I had to build an electronic system to deliver 1/24 second flash I'd probably use high-output LEDs. For short pulses they can do more than the steady-state output. In fact, if the rolling shutter is a fixed design feature of Red, then I bet there's soon going to be a market for such "slow flash" units.
On the other hand, maybe I'm worrying too much. I guess the flash in music videos is there just to "look cool" and if the intended audience thinks that fractional-frame flashes are just as cool (or better) than the old look, why bother fixing it.
Come to think of it, I guess you could create flash-frames just as easily in post.



