I don't really know what to advise, but it sounds like this could be a really great opportunity for you. If you're able to do your current job from home and you think your boss would be willing to allow that for you if he/she knows you have other options, I think it might be worth a shot.

I'll let people who've actually been wahms chime in on that aspect, but if it could work for you I can see it being a great thing.
The only thing I would consider would be what would happen if your boss would NOT go for the work-from-home option. Would you keep your low-stress but boring job anyway or would you follow through with taking the other job? Does the other job work with your ttc plans?