Well, I went ahead and took my own advice. In the Somewhere galaxy, I’ve used a governor especially for recently acquired planets. You’ll note that there’s almost no difference between this governor and Shipper, only the ‘Run Build Shipper’ rule has been removed. I also use this governor for newly conquered planets, which probably isn’t the best solution.
Though there’s precious little difference between this and the Shipper governor (which I previously used as a default governor), the sole fact that the new planet now has a dedicated (most importantly uniquely named), governor assigned is a great help. I highly recommend that you assign governors to newly acquired planets that are designed spefifically for these circumstance.