Breaker -
I use KiX scripts (v3.63) via Task Schedule Service all the time. Most are short term - run either 1 time a day, or every 3 hours etc. I simply schedule a batch file to call the KiX exe and script. I do not keep the KiX executable in my PATH to prevent KiX scripts starting improperly, or even as a virus-type attachment.

Syntax within schedule service:
:\Dir\SubDir\batchfile.cmd

Batchfile.cmd:
:\Dir\SubDir\Kix32.exe script.kix