Trust me, you can live without getting ELT.
I don't get why there is this idea amongst deppers that being an MM is the end of the world. Advancement is just as good and it pays the same.
If electricity or electronics interests you, then by all means, ask for an E-rate. Being an ELT is a good deal, but being a real nuke MM is not any worse by comparison...I wouldn't trade my position with an ELT, knowing what I know now.
There are more important things to worry about at boot camp, like making your rack up nice and neat, stenciling your clothes, marching around, and showering with your friends. Don't sweat the rate part...all of that will fall into place.
Good luck, and remember, no matter how bad it may seem, it all ends at some point.