Should I try to get this covered under EPA emissions warranty?

You might go online and email Ford customer service on their link. It’s worth a shot and the worst that will happen is that they will say no.
The vehicle is only a few months out of the 8 years and also has very low miles for the year model. If the van was a year or so out and had 150k miles on it then I’d say no way.

In the online form be sure to have the VIN ready, mileage, etc. In the comment section be very polite about the issue while praising the vehicle a little bit. (Don’t overdo that part of it; keep it subtle.)
Ask if they could perform a Good Will warranty and considering the age/mileage and the fact that you’ve even mentioned a GW warranty there’s at least a shot they could approve it.
If they do they will likely send you to the Ford dealer nearest you. (also asked for on the form) Hope that helps and good luck.