In T176845: Coordinate harvest broken for Philipines we had to drop the lat, lon fields of the ph table harvest since the comnunity switched over to a single field containing a coord template.

Converters would be the natural way of converting this back into lat/lon fields. However the converter framework is built under the assumption that a single harvested field uses a converter to return a single value which ia stored back into a single. What we would need is for the converter framework to support a single harvested field to bw converted into two values stored back into two fields.