For what its worth there were at least a half dozen SNFO's in my OCS class that were actively trying to switch over to pilot (all with the eyes to do it) and none of them were successful. I have a feeling that some of the guys on here that were asked if they wanted to switch were given that ability because of timing. If you think you have the eyes and SNA is what you want, don't sign for SNFO. It seems that in your case, pushing forward for SNA is not going to jeopardize your acceptance for SNFO at this point. That being said, a bird in the hand...
There were also guys that passed the eye exams at MEPS (some because of the ineptitude of the administrators you describe) that were NPQ'ed at OCS or later. Keep in mind that the tests that you were given are the same eye tests that will be administered at OCS and NASP. So if you legitimately can't pass them now, it could come back to haunt you later. Good luck getting things sorted out.
There were also guys that passed the eye exams at MEPS (some because of the ineptitude of the administrators you describe) that were NPQ'ed at OCS or later. Keep in mind that the tests that you were given are the same eye tests that will be administered at OCS and NASP. So if you legitimately can't pass them now, it could come back to haunt you later. Good luck getting things sorted out.