Wish I could help. Blondie seems to have some good suggestions. I was wondering how you were going to coordinate the "air time" with the "telephone-in" time. Another suggestion might be using a local radio station that invites this type discussion if you can provide sponsors. I am not sure how many sponsors one needs to get air time but it may be worth a try. I am good friends with a local Sunday preacher who has a program on KCBQ in San Diego on Sundays from 3 to 4. If this were possible, the station provides everything including a recording of the broadcast for distribution.
Nils