"I'm neither an attorney, nor do I play one on TV"
And you probably didn't stay in a Holiday Inn Express last night. :)
One thing that might be a lever for going after the school board is the perjury angle. Perjury is prima facie evidence of bad faith; one might argue that, by engaging in what amounts to fraud, the school board violated their oaths of office and thus were not acting as government officials.
[going further out on the legal limb]: While it is true they lied their asses off in court under oath, the trouble is you'd need evidence they lied during their deliberations on the ID policy as School Board memebers to make that argument. IOW, I don't know that showing they lied in court, post hoc, can be used to conclude bad-faith in their deliberations....
OTOH, if evidence is available to show that NOT only were they engaging in bad faith on the witness stand, BUT ALSO during their deliberation of the ID policy, you might well be on to something....
;-)