That's a great initiative! 

OSM is really great for these "shortcuts", and I have used many of these footways in the past, while Gmaps will try to route me to a longer way, often those meant for vehicles. 

Perhaps it's best to post this announcement in channels where locals gather?  It's more likely that local folks are using third-party apps that use OSM data, rather than OSM directly. 

If you're keen to know other OSM contributors (not necessarily based in Lipa), check out the community channels in platforms you're already on: https//osm.org/wiki/PH