TPM,
He does not need to do the Clearinghouse to play JUCO.
JUCOS do not even offer scholarships until January.
For pitchers I like (just to name a few) Polk, Seminole, Broward, Indian River, St. Pete, Tallahassee, Chipolla, O-W.
Of the schools you mentioned the only one I'd be careful with is Manatee CC. Have not had a good experience with those coaches as far as being honest with players and providing good coaching.
TPM is you want to pick my brains some more just call - you have the number.