As a PPL who might be interested, why not offer a group course?
You could then advertise at a powered club for a group of say 5 or 6 pilots to attend.
It might reduce the culture shock to be in a small group of familiar faces. I can think of at least that many people who might bite at my flying club and give it a go. Being able to chat to people I already know about the experience and all being in the same situation would help I think.
At least a group 'taster' might get things going?