If you haven't gotten it to work yet, I got mine working by making my own cable that matches both the BLTouch and that secondary "spray connector" board and have it connected 1:1 BLTouch -> spray connector but am also using the BLTouch firmware from Creality found here: https://forums.creality3dofficial.com/download/ender-series/ender-6/

I bought and am using these as the heads for my cable: https://www.amazon.com/gp/product/B07HLHCVSL