I just tested this, and it did work as a start up script, just added the check for the BigFix service: tools/CMD/install_bigfix.bat at master · jgstew/tools · GitHub
Note: @AlexaVonTess 's example tests a lot more things than mine.
Just specify the FQDN of the desired relay for devices to connect to as the only parameter. Ideally this would be a relay that any domain joined computer could reach.