Dunno if it is possible yet... but it could be that after porting the necessary stuff from SH3/GWX to SH4... and via using an external program...
We might be able to make it so that switching from U-boats and the Battle of the Atlantic... to Gatos in the Pacific... is as simple as a few clicks of the mouse... and the neat stuff we built into GWX will reside in the new environments and atmospherics present in SH4.
Then it is as simple as choosing which side you want to sail for today.
In the meantime we have other stuff to do... and porting GWX to SH4 is a fair bit down the road.
All in good time.