Putting so much support into is Josie probably not the most effective army-building strategy, but it's a lot of fun.
How about something like:
Josie: 70
Laglor: 110
Finn: 80
Eldgrim: 30
Knights x3: 210
Total: 500pts, 16 hexes.
Use the Knights as the screen with Finn and Eldgrim right on the frontline. Snipe from behind with Josie and Laglor, with Josie getting the viking spirits as they become available.
It might work.