I bought some Floral Tubes (of the large 60ML variety for milkweed stem cuttings), and was able to push a Wemos D1 Mini mounted on a daughter board into it. In order to fit the attached boards into the tube I had to use low-profile strip headers instead of the high-profile ones that came with the Wemos boards. However, I don't think that the ESPixelStick V3 would fit because of the height of the components on the forkineye board.

Just something to keep in mind for anyone wanting to design their own adaptor boards to go with the Wemos D1 Mini board.