AH Plausibility Check: Hispanic Client States of Rome

A recent thought occurred: Instead of outright conquering the many various tribes of Iberia/Hispania, what if the Roman Republic instead decided to form client states ruled by Kings either allied or loyal to the Republic as long as they paid tribute/supported the legions (like in the East)? How could this occur? What tribes could become client states (i.e Lusitani, Cantabri, Arevaci, etc)? When could this take place? Does this seem plausible? I am intrigued by the prospect of the ancient Hispanic cultures surviving throughh antiquity in this fashion.
 
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