FPP's (Film Photography Project, Inc.) c-41/ECN-2 kit
I'm sure it'll work, of sorts. I'm not thrilled about this kit, however.
One potential issue is that this kit relies on a very rudimentary (but cheap) form of bleach, i.e. a ferricyanide bleach. We don't know what this means in terms of dye stability and thus how it would affect the archival properties of the negatives.
In a similar vein, the FPP kit is really more of an ECN2 than a C41 developer. This means that the dyes formed will be different than the ones the film was engineered to. The implications are that the gamma may be off from official specs and again, long-term dye stability may be affected.
Of course, a B&W film is less sensitive to such issues than color; so what if you lose a little density over the years - at least you don't have to worry much about color balance, especially if you're scanning anyway. So decide for yourself if this is something you would even want to worry about.
Btw, I'm puzzled by the mention of particulate matter floating around in this developer upon mixing. I've mixed a good deal of photochemistry, including color chemistry, and I've never had anything like this happening. I'm also put off a bit by a mention on
a blog they link to on their own website that states that the "developer in the original kit was designed for color C-41". Given that they use CD3, they must have known that they were not actually making a C41 developer, and they must have (I hope...) figured out that they needed to either boost the pH of the developer considerably to make it similarly active to a CD4-based developer, or perhaps they recommend extended development time to reach the same gamma on C41 films.
All taken together this will undoubtedly work, but personally, I'd not bother with this kind of kit and just get some real C41 chemistry. Pretty much the only thing this kit has going for it is its price, and even that is hardly competitive if you compare it with just mixing something similar together with chemicals easily purchased from e.g. Artcraft or eBay (which, let's face it, is basically what FPP are doing anyway).
Apologies for the sour undertone in this message, but I'm starting to get a little weary of the present offering of color chemistry that purports to be something it really isn't; i.e. confounding ECN2 and C41 developers, using bleaches that were never qualified for C41 film etc. It's all fine if they were transparent about the pros and cons of such an approach, and by all means take whatever liberty you want, but the suggestion that it all doesn't matter...pah. I see lot sof sub-par results (mostly color) that are at least partly attributable to the use of these compromised, cut-corner kits. Including on the FPP blog cited above; the ProImage example they posted there is pretty horrible color-wise and a large part of that is actually due to the developer not being the correct one for C41 film.