Hi Davis Mavis
Welcome to My Swiss Alps.
I have spent many comfortable nights at the Landgasthof Hirschen in Langnau. The kitchen is not as ambitious as it used to be...all of the Emmental inns have a seen a decrease in business over the last decade, but Herr Weyrmann fed me well when I was there in the Spring of 2017. The rooms are plain but comfortable. The restaurant is very good, but has a limited menu compared to the grand feast they used to have available. Still plenty of good choices.I think there is at one deluxe and expensive restaurant about a 10 minute walk from the Hirschen....I have not checked it our for over 10 years. The Golden Lion, across the tracks on the other side of the station; it seems to have a hotel attached these days. The location of the Hirschen is much nicer.
Langnau maintains it role as a market town. In the typical Swiss fashion, there are many small industrial companies there, as well as farm related business. It is a junction point for some of the local railways.
This map will help. Zoom in and you can see the railway lines. play with the menus a bit.
map.search.ch/?pos=626850,199166&z=12 8&poi=haltestelle,mobi lity,zug
I turned on the icons for bus and train stops, under Traffic in Points of Interest.
One train stop up the line from Langnau is Trubschachen. There is a valley that runs northward to Fankhaus and beyond. One of the grand farmhouses up that valley...don't know which one...has a "priest's hole" for hiding Anabaptists from the authorities.
There is a lot to see in the Emmental.
This thread will give some clues. I invite your attention to the attached images.
My favorite inn for the past dozen years or so was the Sonne in Affoltern i. E. The kitchen was excellent. Herr Briggen was a wonderful chef, and kept a good cellar. Now being converted to apartments. ;-(
Instead, I stay at the Bären in Sumiswald, about 12 km away.
Very nice inn, long history in the area, close to Schloss Trachselwald where the Anabaptists were treated rather nastily, good kitchen, good wine list. The Hiltbrunner family has roots in the area; a company owned by the family makes musical instruments, and is a few blocks from the inn. English is spoken by most of the staff. If you speak or read German, you will find the local dialect of "Swiss-German" to be interesting.
Both are a bit north of your area of interest, but the Bären is particularly good.
You can get around the Emmental area by train and bus, which I sometimes do when I am hiking in the area. But, a lot of the service is hourly. For what you are planning, I'd rent a car. Then, depending on where you based, you could use the train and/buses for a sample of the local experience. Some of your villages are near the train lines.
If you want to hike, you can get close to some of the magnificent farmsteads.
Most of your roots are a bit south of the "main" Emmental, but Langnau or Konolfingen could be good bases. The distances between those villages are short.
Herblingen is an outlier- quite a bit north and east...near Schafhausen. Not the same kind of country, at all. A bit over a two hour drive form Langnau, and about 3 1/2 hours by train.
That will get you started. Come back when you have begun to consider a base village. I'd definitely work hard to stay in only one place. However, it might be practical to swing through Herblingen ( or even stay there) after arrival and drive on to , for example, Langnau and stay there. Dopends on your schedule, degree of jet lag, etc.
Will you be coming from the USA? Australia? Jet-lagged? Speak or read any German? I've assumed tha you will be coming in through Zürich....