Try this for a possibility and for a minute forget Occam. This theory? is based on Mrs P's family history and it comes in two parts.
Besides the Huguenots there was quite a lot of Palatine Germans from the same area who came in queen Anne's time. After arriving in London they were finally shipped off to Limerick where they stayed until they either move to America or came to England because of the Irish famine. Most of these settled first in the Liverpool area and then in Oswaldtwistle. But prior to this Palatine lot; Cromwell's army which were mainly German mercenaries were left behind in Limerick. These naturally formed a relationship. So why Rossendale? Why not.