I have never seen a half-round set like that. The best bet would be to go to
www.juststrings.com and see what you can find. You could also look in the single strings section and possibly put something together.
My concern would be what a .60-.145 set might do to your neck, especially since half-rounds/ground wounds are usually a little more high tensioned than many sets of the other types. Good luck with your search.