I don’t think removing pool info will do it for antminers but you could try. Mine will seem to continue to hash even if the pools are down or my internet connection is disconnected (but with pool info intact). However, one way to ‘soft stop’ that I can think of is to restart the miner. During the start up process, it will not hash right away so you could use that window to turn off the machine. However does doing a soft stop actually help with the electronics, I don’t think so.