Thanks for all the ideas so far. One option for the Devanu would be to actually include an excess of points within the force - maybe including an extra Jenta so they can choose which to use. Strictly speaking that is probably cheating, but I don't think Devanu players would complain too much
Devanu Starter: 300pts (+50pts), £36
1 Sempa
1 Jenta (2 different models provided)
4 Grishak
1 Kosok
That force would have the advantage of fitting the original scenario in the first rulebook.
I was also considering the idea of increasing the size of the starters to fit with the main characters and aiming at 400pts:
Roban, 2 NuraKira, 2 Bodyguards, 5 KalJoran: 395pts, £39
Danomar, 2 Knights of Relan, 7 Knights: 405pts, £43
Arak katain, 1 Jenta, 3 Grishak, 2 Kosok: 400pts, £36 (could add an extra Jenta, allowing an option or letting Arak be used as a Kopa)
I actually quite like the feel of all those, but I'd be nervous whether they give a good introduction to the game. What do you think?