Jorge

Yes the PQ mixes quite readily in alcohol (I have found it is a little quicker mixing it in methanol rather than Isopropyl).

I have found that the alcohol/PQ mixture mixes very readily with ethylene glycol at room temperature (I haven't tried it yet with propylene glycol).

The ethylene glycol version should have a somewhat longer storage life than the alcohol only version. Time will answer that question.

As Patrick Gainer has indicated, with the developing agents protected by alcohol or anti-freeze, addition of sulfite (or bisulfite) is optional and not really needed.