Perhaps Old World as is, but a much smaller ocean separating the New World's Naggaroth and Lustria from the Old World, much smaller desert separating Badlands/Border Princes from Araby or The Land if the Dead?  Maybe add some new passes so you could come from the Blasted Lands too?

Could probably put stuff in the Worlds End Mountains too.

If New World, Naggaroth and Lustria, is closer that would help get more groups in the mix and give more space for completely original groups.

I kind of like it as is but maybe we can figure something out.  I too just want a fix of some Grim and perilous fantasy