Another speculative thought. Suppose we have all been assuming that Falcons will try to land on a barge at sea or accept the payload penalty of RTLS, when all the tests have actually been in support of a launch at sea to a land recovery.
Sea Launch has the sea going craft to launch large rockets at sea. They are also, according to rumors, not making quite as much money as the investors would prefer. It seems possible that they might be at least semi-motivated to sell off the under performing launch assets.
What if the real intention of SpaceX is to acquire those assets at bargain prices for use in house. Launch a few hundred miles at sea from Vandenburg for a feet dry landing there, with the actual launch location dictated by the desired launch azimuth. The first stage would never have an IIP intersecting property on land, while the second stage would have an IIP that moved fast enough to minimize theoretical injury and property damage probabilities. A day out to launch and a day back. Twice a week seems possible.
From Brownsville the trip would be even shorter. A quick run to a point that gave the right launch azimuth and distance from the cape for a Falcon recovery there. Possibly a day trip with the launch frequency that implies if the business develops.