Update: DO NOT DO THIS. Apparently even withdrawing it doesn't make a difference I am upset (and feel very stupid) for having done this.
I tried it, here's the reply I got:
Your request has been reviewed by the Department of State and unfortunately, we cannot accept your request to file your petition in X.
USCIS does not authorize the Department of State to accept a local filing abroad if the petitioner has already filed a Form I-130 domestically for the same beneficiary. If exigent circumstances exist, the petitioner should request expedited processing for an electronic or domestically-filed petition.