Sorry to tell you, but you're NOT correct! Assumptions like this may well be your last one. Airspeed alone is not an indication of climb gradient, unless used together with the climb rate - and you would need C-130-Boosters to beat a 737 there!
The only way to be safe is when you are sure to be able to liftoff well before the point were the 737 rotates and then immediately make a turn into the wind (crosswind departure) - I admit, not always an option at bigger airports.