Sorry, I cannot help. You are about a century before where I am in researching the Hemmerde area currently
I did a Hemmerde search and you are one of the few people that have ever posted on any board for this village. You seemed to be struggling between two surnames - which for this area, they could be one in the same family. (You mentioned both Broehl & Poit/Poot in the Hemmerde area.)
I can imagine there may be some migration between the Hemmerde and Nederhemert - trade, military, pilgrimage. I would guess that the importance of the cities' original names would matter depending on when the migration happened. As you mentioned, there are several cities which are traced to 'Ford Gathering' and thus might be a coincidence at a later date.
The church records seem to start about 1730 so any advice how to get back any further? The Hemsaeer's were from a very small village Siddinghausen - most searches of this name go to Siddinghausen in Bueren. The Hoelings are in Flierich and Hemmerde and assumed the Himplaesser estate/name. Nott/Notte seem to be in Flierich and he assumed the Tapprogge farm/estate/name. Schmalen was born in 1735 in Hemmerde.