So I stole the script from https://jamfnation.jamfsoftware.com/featureRequest.html?id=751 and tweaked the wording a bit.
#!/bin/sh HELPER=`/Library/Application\ Support/JAMF/bin/jamfHelper.app/Contents/MacOS/jamfHelper -windowType utility -icon /Library/Application\ Support/JAMF/bin/jamfHelper.app/Contents/Resources/Message.png -heading "Software Updates are Available" -description "Would you like to install updates? System may need to be rebooted." -button2 "Install" -button1 "Cancel" -cancelButton "1"` echo "jamf helper result was $HELPER"; if [ "$HELPER" == "2" ]; then /usr/sbin/jamf policy -trigger SWUJH exit 0 else echo "user chose No"; exit 1 fi
I also tweaked the cancel button due to when I was using it in it's default form everything returned "user chose No" and it wouldn't run the trigger.
Now when I select install, the box disappears then immediately reappears and I have to choose install again, and then teh box stays gone, but the trigger never starts the updates.