If you can't instruct, how do you plan on ever becoming a captain? New FO's are usually gonna need a little help getting the "feel" of a new airplane, even after training and IOE. About the only thing you'd be able to do with that low of total time is pull banners or drop skydivers, and even that may be difficult to secure with a given company's insurance requirements. Give instructing a shot. Instructing can often be a challenge to the instructor: "How can I get this complete
idiot (and it'll feel that way sometimes) to understand this simple and obvious (to
you) concept??" Believe it or not, by finding ways to convey the concept to a complete amateur, you will better understand it yourself. Go ask a guy who's been flying 135 or 121 for a few years if he remembers the equation for figuring pivotal altitude for eights-on-pylons. Betcha he won't. You lose what you don't use, but the more you've gone over it, (ie, taught it) the longer it'll stick with you. Also, students may inadvertantly find new and exciting ways to potentially wreck the airplane with your sweet cheeks aboard. Keeps you on your toes, helps avoid complacency.
I realize that you stated that you are not "above" instructing, the pay, etc etc. That may or may not be true; people come up with some strange ways of rationalizing things. (As any good CFI knows.)

Perhaps you
ARE perfectly capable of instructing, but have no confidence in your ability? That lack of confidence is not something you want to take to an airline. Perhaps it is a percieved or real lack of knowledge on your behalf that makes you feel unprepared to instruct? That's gonna shine thru during any airline interview. The interview board may well ask you to describe for them the National Airspace System, the fuel system for whatever you've been flying, or how to read a chart. As you correctly stated, instructing IS the quickest way to the total time required to progress in this field. It WILL make you a more competant pilot, and as long as you put a little effort in to it, you may not be as bad at it as you think you'll be.
Oh yeah..And if it really is just your
attitude, nobody'll want to fly with you anyway.
Good luck.