I don't understand your suggestion.
There is no point to go to Nxt AE while the IPO is still open here (price on AE will be the price here)
And when the IPO closes here there will be an exchange from sim.
so the only advantage is that it will let people that already invested in Sim and want to sell their stake @ market price / small loss.
This only make sense after the IPO closes and prior to the SIM software ready with main-net SIMCoins. And if there is considerable time in between these two events.