Smaller size equivalent of B-L072Z-LRWAN1?

[JKott.1]

We have a system implemented with the development board B-L072Z-LRWAN1, now trying to reduce the size of the system. Could you help us in identifying a small size development board with similar functionality? 

[Tesla DeLorean]

There are a couple I'm familiar with, search on Grasshopper LoRa, there is another board like it, even smaller, and I recall there being an AdaFruit Feather board.​

[Tesla DeLorean]

https://www.tindie.com/products/tleracorp/grasshopper-loralorawan-development-board/

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Also SensorTile​ and Gnat boards.

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K​ris makes some very nice boards.