The details of the AMA intro program can be found here:
AMA Introductory Pilot Program PDF
The specific passage that covers this situaton are thus:
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A non-AMA member may fly at a chartered club site and receive member liability insurance protection as long as he/she is flying under the direct supervision of a club-designated Introductory Pilot Instructor. The Introductory Pilot Instructor must hold a current AMA membership with the “Intro Pilot” classification. Supervised instruction must take place at an AMA chartered club’s site, and must be closely supervised.
The non-AMA member will have the same liability insurance coverage that other AMA members receive, solely while under the direct, one-on-one supervision of the Intro Pilot Instructor, for a period of 60 consecutive days starting from the first session. No other AMA benefits are provided to the non-AMA member.<p align="left">Participation in this program is on a one-time basis only. This program covers assisting new modelers through education and training activities only, and does not constitute permission to fly in any organized event of AMA members or clubs, sanctioned or otherwise.
No AMA card will be issued to the non-AMA member during the 60-day introduction period. </p></font>
As long as the student flies with an AMA Introductory Pilot he may fly at an AMA field for up to 60 days under the Intro Pilot program. He will be covered by full AMA liability insurance as long as he is flying with the AMA Intro Pilot instructor.
However, individual clubs may enact other guidelines covering this issue. But this is what the AMA's plan is, and offers.
Ken