For a slightly different take on the whole regional recruitment thing, a feature I personally love, make it instead/also so that certain buildings present hard choices in direction. For example, the CIS is primarily backed by 3 or 4 companies, off the top of my head I can think of the Trade Federation, Techno Union, Banking Clan and Commerce Guild. If one building slot on a world were used to say which company were 'backing it' then certain different droid options would be available. All of these companies used certain droids, such as B1s, but each had a handful of unique droid types that only they produced, as well as a few unique ships.
In the same way, I agree with whoever made the post about this before, but the Republic should start out with Kamino as its only source of Clones, with expansion available after some time through the construction of Spaarti cloning cylinders, or something to that effect.