This is a total necro post, but since no one replied I'll chip in in case you or anyone else is interested....
I suffer from narcolepsy. I don't experience cataplexy (falling asleep at random times), but I do suffer from excessive daytime sleepiness, I enter REM within minutes of falling asleep, and have the amazing talent to be able to fall asleep anytime, anywhere if I want to.
Anyway, I was prescribed Provigil (brand name for modafinil) to treat my symptoms. I am taking 400mg daily and have no noticeable sides other than it makes my pee smell a bit peculiar.

It does a great job in combatting EDS and helps me focus like a normal person.
As far as my suggestions for you.... There have been studies done for off-label use by the military as a replacement for amphetimines with some good results. I can't really say I would highly recommend it as a workout enhancing stim (which is what I am guessing you are getting at). At least for me, it doesn't give me THAT kind of energy. It's more of an even "normal" feeling for me. Not jittery or rage-y, just a more alert state to keep me from narc-ing out.
It's classified as Sched IV here in the US, BTW. I guess it might be helpful with motivation, but I think an ECA stack would work just as well for or even better for a PW stim and be easier/cheaper/legal-er to obtain.