I'd be really careful about doing anything that impacts your track season. Any college sport is a huge commitment, and you will kick yourself in the a** if you shortchange it.
I rowed, and on pretty much the same schedule - 430-7 Monday thru Friday, with a captains practice Saturday morning. During the year I would occasionally fill in early practices on a local junior hockey team if someone was sick, and that threw me off for days with rowing. I stopped after freshman season.
If all else fails, talk to your coach. Tell him what you want to do, and get his advice. If you have a good relationship, he will help you out.