What i would do is purchase 6 inch plastic water pipe cut to the height you want the fence.Drill holes where you want the wire to go through .
insert rod bigger than the fence wire.
slide the pipe over the fence post fill with concrete, after a few hours remove the rods so you now have holes for the fence wire
leave the plastic pipe in place & then paint, it gives the post a good solid look.
in the photo is 6 inch pipe filled with concrete