Just FYI this is a hugely overstated risk. You can melt leaded solder with a Zippo (~350F) while lead only begins to produce a tiny amount of point vaporization at ~900F, so the safe range for your iron's temperature is large.

You're doing the right thing setting your iron to match the solder. Beyond that, just thoroughly clean your station and wash your hands after you're done.

Separately, I don't think rosin is all that harmful, but it's certainly very irritating if the fumes get in your eyes. Your basic fume hood should be more than sufficient.