Well, technically they may refuse to issue I EAD if they know that there is an RFE on I-140, but there is no harm in trying.
btw, my ND is Sep 26 2003, I got my EAD and AP approved but they never touched my I140,but looks like they touched your, what different did you do??????
Hopefully you must get ur I140 approved in next month or so.
Wish best of luck.
-manoj