I like some of the names you listed.
Cole Hamels might be a good target given his age. One year deal?
I would be all over Rich Hill on a one year deal.
Keuchel might be worth a gamble on a 2 or 3 year deal.
Roark, Alex Wood, Kyle Gibson, Wade Miley are all interesting enough mid-level targets of varying talent levels.
There are enough options that it would be unacceptable for them to only pursue guys like Nova, Cahill, Chacin, Buchholz.