I did add just a little bit of MO to a small water bottle filled with water (has a mist type spray) and tried it on the top layer of hair as a sort of refresher after being out in the heat/wind and I think it did help a little with the frizz. I just sprayed it on and sort of carefully smoothed it down.

So if my other method doesn't end up working out maybe I can fall back on this for the top frizzes once it dries at least. I doubt it will fix them altogether, and I wouldn't want to use too much too often to avoid build-up of the oil, but any little bit helps sometimes.