"am not a lawyer, but if it is done in a way that none of the info is at risk of being traded on by any of the parties, it would seem doable to me, in my opinion."
Well that's the tricky part now isn't it? Let's say Ambassadors are now wearing three 'hats': Ambassador, investor and PR reviewer/'insider'.
It seems to me that all it would take is one significant purchase by any of us reviewing a PR that had material info that was likely to trigger a 'run'...signed contract and advertsiing committment by Fortune 500 company, for instance, and before you can say 'Bud Fox' one of us is in front of an SEC investigator stating "I din' know nuthin'.
Paid employee status, with all of the trading constraints inherent in such a relationship, would keep me from making such a trade and save me from a 'perp walk'!