I'm not so confident that the recruiter could get you either Opt. 40 or 18X. Sure, they can pull the job for you, but the security manager at MEPS has the final say, and they usually deny anyone who has ANY alcohol or drug charge (regardless of type or how long ago it was). You also won't know until you're down at MEPS finishing your paperwork. That said, if it's what you want, go for it. If not...be an old-ass E4 for a little while, then go to selection (where the OWI is waiverable, and shouldn't be an issue due to how long ago it was).
