by M0ebius
We have done this and also tries the dypaca games board (basically 1st edition board in the south).2nd option turned to be much more fun, having less territories and resources in the south fortced tyrell to move north in force and baratheon never went south of storm end.
When playing on the 2nd ed board without greyjoy, there were lots of less politics, and almost all the action went south which allowed start too much breathing space (and a less interesting game for them)