If you are willing to grind off of blues, the Chessboard in Butcherblock wouldn't be too bad. Less room for disaster as compared to Befallen.
Kurn's Tower is also a potential spot, but may be a bit of a pain to get to for you from here.
From there, I'd probably start pushing in to Unrest around 15-16 or so. Beetles, while not undead, are good targets at the get go. If you can link up with a higher level druid for Shared Wolf Form, this will really help a lot, as wolf-form is no-kos in Unrest. Unrest can take you well past 20 to even 30 depending how long you feel like not changing scenery, especially lower down.
Lower Guk would then start to open around 30, depending on gear. Might want to wait a bit longer. I've always hated dungeons, but being handy with a root and a line on the zone line can help a lot.
If you are suicidal, 35+ or so can start to mess about in Kithicor Woods at night too for plentiful undead! City of Mist can really start to shine too, but there are lives to mess with as well, unfortunately.
It really is slim pickings with just Vanilla and Kunark. I'd never go back, myself, too many good improvements outweigh the bad from the past multiple years. But best of luck!