I've got a customers 175B IH setting in the yard in about the same shape track wise from setting. Great tracks, look nearly new in fact, but tight as a tick in places when it was torn down 4 years ago, and probably even tighter now. I don't know what we're going to do about them if he ever comes up with the money to repair the thing.
That said, the only place I know for sure that has a track press is Wilson Finley. CAT and some of the others in the same area may have them too, but if so I've never heard of anyone taking 'outside' work to them. Here's a link to their site.
Given what all is involved in pushing the pins out and back in, I'd ask them a price to do that, and also check on the price of a new set or chains and bolts. If your's are rusted as bad as your saying the labor involved to take them apart and free them up just might be more than simply putting your good pads on a new set of chains.
If you ever run into anything else feel free to give me a shout via email and I'll give you my number. Good luck.