If it doesn't fit (frost free spigots are a little larger) than he should be able to use a hammer drill to enlarge the hole and a 10" or longer frost free spigot to get through the foundation.
I don't have an exact price but I got a frost free spigot installed through my foundation (also cast in concrete joists but I wanted the spigot lower so just went through foundation) and a gas line moved for $500.
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