[Bob Steele]

I don't see why this would be illegal. You are allowed to use regulators/accumulators anywhere you wish. You just have to have the mandated one that regulates the working pressure of your system down to 60 psi. Beyond that point you can have regulators anywhere you wish. Of course all they could accomplish would be to lower the pressure into a given cylinder or portion/stroke of a cylinder.

You are not plumbing the outputs of 2 solenoids to the same cylinder.

As always, your best bet is to ask in Q/A

Al may have misunderstood your initial question. His statement is entirely correct but it doesn't answer your specific question.

He is the Chief Robot Inspector... and not just a "Rules Guru" by the way