Not bad at all sir...
Personally, only for flavor's sake, I'd go with another squad of unliving...
You could take away one of the tribal squads and have two larger Unliving Squads--they make great missile soaks.
So something like:
4 HG + Chieftain + STB (Deflection) = 198
4 Tribals + Chieftain + STB (Deflection) + Swordsman = 207
6 Unliving = 108
6 Unliving = 108
5 Slingers = 140 w/ Cursed shot of your choice (7-15 more points)
Monarch = 102
Wyrd = 80 (40 more w/ Wall of Thorns, Savage Roots, and Voice of Despair)
That would be 990-998 points
Depending on the type of cursed shot you could also change one of your standards or swap out for a HG Hornblower instead. Mix and match to your own liking.
As for adding Devout, you are spot on. The Damned and Blood Hunters would add great mobility in the form of beastial cavalry. Good luck!