why using z end stops if you plan to use bltouch? you can specify in your klipper firmware 2 independent z motors with z alignment during bed levelling, I’m not running my Sapphire plus with bltouch as it’s belt synchronised but sure there must be klipper config file on github or elsewhere for your use case, if you won’t find anything there’s discord server for Sapphire printers, I’m sure someone will help you to set it up