Yes, you can go get to Placencia from the Gales Point area via Dangriga. However, most buses on the "coastal highway" don't actually go to Gales Point but drop you at the junction of the Gales Point road, which is a little distance from the village.
Or you could drive or fly to Dangriga. Most hotels in Hopkins and in the Gales Point area will pick you up at the Dangriga airstrip.
--Lan Sluder