OK, if you're using a Hakko, heat isn't a problem while soldering. The silver solder idea sounds good to me. When I was into my other hobby, I used to mess with electronics where .01 ohms of resistance would make a difference. I started using silver bearing solder and there was never any measureable increase in resistance through a well soldered joint.

Lately, I've been using the roisin core silver bearing solder from Radio Shack and it's been working well. Doesn't add any (measureable) resistance and makes for a heck of a mechanical bond too.