I have verified that yes, 30 hours is acceptable where I work. It's been done, along with 32, and possibly shorter. Most of the benefits are pro-rated, but we'd still cover the health insurance fully. You could still work more and get paid for those extra hours, but the benefits would be according to how many hours you signed up to work.
Examples: If you sign up for 30 hours but work 50 hours, you get 75% benefits and 125% pay. If you sign up for 32 hours but work 38 hours, you get 80% benefits and 95% pay.
Please do post that job on the above linked job board (it's free)! It should get you at least a few good eyeballs and the community of people who care about the thirty hour week will appreciate it as well.
I’ve been working on a job board just for this: https://jobs.30hourjobs.com
Please let me know what you think!