it's worth a shot to save a couple of hundred bucks, but don't get your hopes up.
A Focus toe bolt isn't typical rusted hardware, in which the threads have bonded to the nut and/or the head has bonded to its mating surface. In those cases, penetrating oil can be effective because it needn't travel far, and the torque you apply to the head is sufficient to overcome the relatively small sticky areas.
With a Focus toe bolt, several inches of the threadless shaft bond to a metal bushing inside the LCA. Because it is inside the LCA, there's no clear shot for penetrating oil, and even if there were, it would have difficulty travelling that distance. Plus, the bolt head is too small to accomodate the torque you would need to apply to overcome the sticky forces - if I recall my high school math correctly, the surface area of that shaft is in the neighborhood of 6 square inches, which overwhelms any torque that can be applied to the head.
"I'm jealous of girls because they get to wear dresses." (Todd Flanders)