Just use OLM. The Fusion's 2.5 is really the Mazda MZR engine which is quite stout. It also happens to be pretty easy on oil. I got a data set of well over 200 UOA samples from Blackstone for the Fusion 2.5, and the average iron wear was barely 1.1ppm/1k miles, so have no fear. I'd run it until the OLM gets down to 10-20% regardless of how long it takes, it is fairly accurate and will adjust for lots of short trips.
If you're concerned, just change it around 12 months regardless of mileage. I have over 100k of UOAs on a 2011 Fusion here on the board which is mechanically identical to yours. I started with about a 7.6k OCI and ended up stretching it to over 17,000 miles. I'd say you have zero concerns with anything 10k and under as long as you're using a name brand oil in these engines.