If Kellam has Rally Defense, it's immensly useful here, too.
Also, here's a dirty little trick to do, too:
Code:
EDGE OF MAP
___________
XR X
XTX
X
The person on R being a staff user with a Rescue Staff. Rescue Tiki. Since South and West is blocked by one of your units, she can't be put there, so she'll be put to the east of the Rescuer. Two squares away from the nearest point an enemy can reach.
Now make an even better wall, with paired up units and possibly Kellam with Rally Defense and a javelin in the spot where Tiki was. Or just someone who can take a ranged hit and deal damage back, but it's the perfect Rally spot.