A DS of our friend got principal to USAFA (#2 choice) from a state where 1 nom is all you can expect. He...notice I said the DS, not the folks, contacted the MoC to see if he could switch it to USNA. The MoC contacted the principal to USNA to see if she wanted to switch. She did because between the time of submitting their list for the nom, she decided she wanted USAFA over USNA. 4 yrs later they both commissioned, her from USAFA and him from USNA.
Key thing here is the folks don't do the legwork. It really has to be from the candidate.
However, as stated it is Jan. 30th and the slate must be submitted by tomorrow. Just realize that can be a lot of juggling to do within 24 hrs for the MoC if they submitted a full slate of 10 for both USNA and USMMA. They would need to find someone that wanted USMMA over USNA and did not get a nom to move them on their slate.
It doesn't hurt to ask, but be prepared for it being a negative. In terms of baseball, this is the bottom of the ninth and 2 outs, you have to swing now for the fences.