I have very very limited experience with color flashing, but I wanted to mention that one time I tried do a quick and dirty experiment with it by leaving the negative in that I had already done a successful test print with but didn’t like the blown highlights, and simply added a diffuser under the lens to get my flash (with adjusted exposure through either lens diaphragm or time) and it actually worked quite well.
I wouldn’t be surprised if that would work for many images since rudimentary automatic color balancing is usually based in the idea that most images will average out to gray, and in the case of flashing, an averaged out color cast would match the overall tone of the image. In my case there was an abundance of red but that added a nice warmth to the highlights that complimented the rest.