The Expansion Planner must have a page only for Branch Offices. Look for a new planet to build a new branch is very tedious.
There is a method to somewhat alleviate the problem.
TV production of planets is considered some sort of orbital deposit, and it will be displayed in the galaxy view. Press alt, and you can now see how much TV a system produce, even if you don't have the required intelligence level.
While you can't find these systems in a list style, there are very few systems with normal resource production of some kind in two digit, making the TV production (>30 for valuable candidates) stand out in the galaxy view quite easily.
If you however just wish to get executives' retreat or xeno outreach on a decently populated planet, though, there is no fix. I'd doubt if that really worth the initial cost and the emipre sprawl penality anyway.