I don't really understand this post. First you tell us you don't like Pachs, then you ask whether it's safe to keep them on the gun, because wood grips are worse. Your question about rust has probably been answered. Myself, I would say use RIG under the grips and check them every once in a while, and you will not rust the gun.
However, the real question is why would YOU have Pachs on your guns? I would, of course, because they fit MY hand very well. What idiot told you that Pachs are more comfortable for YOUR hand than wooden grips? Was he looking at your hand when he said it? It sounds like you already know better. Go look for some wooden or even rubber grips that you like, and use them. BTW, the internet is NOT a good place to buy grips, and only so-so for even discussing them. Go to your local gun store (LGS) and try out what they have. If that doesn't work, see if anyone at the range has something you can try. You could then actually buy on the internet if you find what you want.
Remember, grips are usually cheaper at the LGS, because you only have to buy one pair for each gun. Mail order, you stand a good chance of buying two or three sets before you get the right one.
Good luck!
