Board Thread:General Discussion/@comment-26261153-20150716195032/@comment-25926288-20150716201823

In theory, the Black Fairy's wand charged with fairydust can create portals and Rumple should have known where Bae was. If Peter didn't let him go, Rumple would have trveled to the LWM for nothing.

Charged with Fairydust or even Pixiedust, Rumple could use it in the LWM. Magical items work in LWM.

So, yes, he could have went to Neverland and even LWM and got Bae and went back. He had a crystal ball that can see across worlds. Neal used it to see Emma in Neverland.