What I didn't mention was that this was part of an idea for integrating bot-cleanup into the playoff system, and it would work a little better if bots weren't becoming owned teams during the playoffs, but rather simply to leave them as bots, then moving them down to the bottom division, and then letting new owners replace them after the relegation is finished.
As an alternative, is it possible to start new teams out with a 0-0 record, and only place new teams into each league once per season (assuming that you don't run out of space). These teams would simply play a fragment of the schedule and then go into the playoffs.
So in the USA, you start out refilling the low-numbered series in IV, which should happen pretty quick, and then just keep going on into the higher numbered leagues in IV, and then on to V. If you did get to V.256, then you could restart.