Jun... that's a good initiative. The concept could easily be expanded into an Anilao resort transfer service.
As you say, marketing and promoting it to tourists is the critical factor... but that's nothing beyond some basic web-design, SEO and making use of available internet publicity sources... plus some clever partnership forming and official accreditations.
If a reliable, daily transfer service to/from Anilao resorts was properly marketed, I am pretty sure it would create its own market...and dominate it.
I'll say this again - Thailand, Vietnam, Malaysia, Laos and Cambodia all have reliable tourist travel networks. The concept is proven. The market is here, if anyone cared to exploit it.
Offering 'a lift' to Manila-based divers isn't a new market...and doesn't have much growth potential.
Tourists generally aren't interested in catching local bus/jeepney/trike transport in a foreign country. I've lived here for 3 years - and the route/process described in these threads still confuses me. Instructions like "Just take a Ceres bus from Buendia" don't mean anything to a foreigner who has never been here before. It's not something I'd be eager to do - especially with several heavy bags full of expensive dive equipment, at the end of a long flight. For families, elderly or infirm tourists, it's a non-starter. It's a very different experience for a tourist, compared to what a local Filipino would think of it.