and another little thing is your burning engine, in the first phase of the take off will be giving you 100% thrust (maybe even a bit more ...) so you'll be clearing a good deal of obstacles very fast before shut down. you'll much more than your single engine climb gradient.
so msa or radar safety altitude will be reached much earlier. and clearly as someone said before it's better to take a little more time and make it in one approach than going around or overshooting your loc or g/s.
seb