Stephan,
There is no easy way to go about using script to check the authentication tab. I was also in the same boat few years back and ultimately with helpdesk's help we "brute force" set all workstations to the PEAP authentication we wanted.
However, there are few things you can do (other than the PEAP authentication)
1. you can set the reg key for EAPOL by pushing it out through GPO
2. you can enable the authentication in HP procurve switch one-by-one so it will not impact helpdesk's workload.
my two cents.
-Charles