What about some publically available information on your trip plan(s)? Either here or on a blog/website.
Information on your current stage of planning, logistics, any arrangements you have made or intend to make, costs, visa and overflight requirements, insurance, maintenance, etc., etc., etc. would probably go a long way to get more people interested.
I imagine there must be a critical number of people and aeroplanes which gives the most cost-efficient solution. Too few people and airframes and the individual costs skyrocket. Too many and the logistics become even more of a nightmare.