It sounds like you're in an internet spiral of worry here, watch out =) Find a friendly bike shop that will let you test fit a 700 rim and you can put the "will it fit" question to bed, or better yet a local bike coop if one exists. That's where bikes with willing owners and a good patina shine, hyuk hyuk.

Of the 10 or so bikes I've converted to 700 (converted, haha, sounds like work)... only 1 has required longer reach calipers. It was a Nishiki Cresta and compared to replacing eyelets, slapping on some 20 dollar Tektro brakes from eBay is super easy. But seriously, those eyelets, they look like they have lots of life left in them. I will now quote Zoolander, "doesn't anyone notice this, I feel like I'm taking crazy pills!"