Total war Warhammer - Wood Elves defending Lookouts far from the Forest

There really isn't, lookouts are meant to be taken. As you can easily restore them if needed. The developers even mentioned this in their tips and tricks. They arent meant to be played as the other factions. Like the horde factions this is what makes them unique. The source and full article regarding wood elves can be found here.

Don’t get too attached to your outposts. If you lose one you don’t always have to backtrack to reclaim it, moving forward is always a viable option! It’s better to have 20 semi-secure outposts that 5 secured ones, because those faction-wide bonuses form outpost buildings tend to stack fast!