I don't think so.
Yellow
Interlayer
Magenta
Interlayer
Cyan
UV protection layer
Physical protection layer
= 7.
The physical protection layer may even be coated as two identical layers to achieve the required thickness. I guess you could get away with a very thin layer, which would produce a rather fragile product.
Not to mention that I don't really see how it would make much sense for Harman to jump into a declining market with low margins, i.e. RA4 paper.
This inconsistent. The emulsions are what make the paper optimized for laser exposure. Moreover, Fuji's paper expose fine without reciprocity failure up to at least 10 seconds, which in practice is plenty for nearly all color printing people to with enlargers. Beyond that, you'll still get away with it without color problems, most likely. So I don't see how Harman would somehow by coating change this behavior in a way that's not relevant in the real world to begin with while using the same emulsions.
Another issue is that it's unlikely Fuji will supply emulsion to a 3rd party; emulsion making and coating are effectively integrated operations (there's a buffer in between them btw) within the same physical plant and I don't think Fuji actually has any infrastructure in place to syphon off emulsion batches for external resale. Not to mention the fact that the entire quality control loop between emulsion making and coating is closed, so supplying ready-made emulsion is something that totally violates the production philosophy of Fuji. Their emulsions are simply not made to be stand-alone, marketable products.
Not to mention that you can't actually sell a color RA4 emulsion. They're not stable and need to be mixed at the time of coating. It's theoretically possible to kludge something with intermediates, but it'll be a complex effort and it's doubtful if it would be any more effective than just making the emulsions in situ like any film and paper coating outfit has done since the dawn of silver halide!
Also, what's the rationale for theorizing that Harman would somehow be more fit to produce at a scale that better suits the market (which market, exactly)? It's easy and relatively cheap to purchase a box of 1 or 2 rolls of Fuji paper. Do you imagine Harman will somehow substantially beat this price point while not making emulsions etc.?
The idea doesn't add up in my mind.