Self Service policy to enable end users to enroll their Macs into an "Early Adopter Program" or any other type of enrollment. Create a Smart Computer Group to identify early adopters and scope policies.

"Early Adopter" extension attribute

#!/bin/zsh

enrollmentStatus=$( /usr/bin/defaults read '/Library/Preferences/EarlyAdopter.plist' Enrolled )

echo "<result>$enrollmentStatus</result>"

Toggle Early Adopter Program.zsh

#!/bin/zsh

# get current day and time
timestamp=$( /bin/date )

# get name of currently logged in user
currentUser=$( /usr/bin/stat -f '%Su' /dev/console )


# get current enrollment status
enrollmentStatus=$( /usr/bin/defaults read '/Library/Preferences/EarlyAdopter.plist' Enrolled )

# check enrollment status
if [ "$enrollmentStatus" = "Yes" ]; then
	
	# display dialog to end user to unenroll a Mac
	response=$( /Library/Application\ Support/JAMF/bin/jamfHelper.app/Contents/MacOS/jamfHelper -windowType utility -title "Early Adopters Program" -heading "Enrollment Status" -description "This Mac is currently enrolled in the Early Adopters Program.
	
Click Unenroll to remove it from the program." -button1 "Unenroll" -button2 "Cancel" -icon '/System/Library/CoreServices/Software Update.app/Contents/Resources/SoftwareUpdate.icns' )
	
	if [ "$response" -eq 0 ]; then
	
		# unenroll Mac from Early Adopter program and log the username and time
		/usr/bin/defaults write '/Library/Preferences/EarlyAdopter.plist' Enrolled -string "No"
		/usr/bin/defaults write '/Library/Preferences/EarlyAdopter.plist' Username -string "$currentUser"
		/usr/bin/defaults write '/Library/Preferences/EarlyAdopter.plist' Date -string "$timestamp"

        # update Jamf Pro inventory and enrollment status
        /usr/local/bin/jamf recon
		
		# display dialog to end user to confirm unenrollment
		/Library/Application\ Support/JAMF/bin/jamfHelper.app/Contents/MacOS/jamfHelper -windowType utility -title "Early Adopters Program" -heading "Enrollment Status" -description "This Mac is was removed from the Early Adopters Program.
		
Return to Self Service at any time to reenroll." -button1 "OK" -defaultButton 1 -icon '/System/Library/CoreServices/Software Update.app/Contents/Resources/SoftwareUpdate.icns' -timeout 10
		echo "$currentUser unenrolled Mac from Early Adopter program."
		
	fi
else

	# display dialog to end user to enroll a Mac
	response=$( /Library/Application\ Support/JAMF/bin/jamfHelper.app/Contents/MacOS/jamfHelper -windowType utility -title "Early Adopters Program" -heading "Enrollment Status" -description "This Mac is not enrolled in the Early Adopters Program.
	
By clicking Enroll, you agree to test and provide feedback about newly installed software updates." -button1 "Enroll" -button2 "Cancel" -icon '/System/Library/CoreServices/Software Update.app/Contents/Resources/SoftwareUpdate.icns' )
	
	if [ "$response" -eq 0 ]; then
	
		# enroll Mac into Early Adopter program and log the username and time
		/usr/bin/defaults write '/Library/Preferences/EarlyAdopter.plist' Enrolled -string "Yes"
		/usr/bin/defaults write '/Library/Preferences/EarlyAdopter.plist' Username -string "$currentUser"
		/usr/bin/defaults write '/Library/Preferences/EarlyAdopter.plist' Date -string "$timestamp"

        # update Jamf Pro inventory and enrollment status
        /usr/local/bin/jamf recon
		
		# display dialog to end user to confirm enrollment
		/Library/Application\ Support/JAMF/bin/jamfHelper.app/Contents/MacOS/jamfHelper -windowType utility -title "Early Adopters Program" -heading "Enrollment Status" -description "This Mac is now enrolled in the Early Adopters Program.
		
Return to Self Service at any time to unenroll." -button1 "OK" -defaultButton 1 -icon '/System/Library/CoreServices/Software Update.app/Contents/Resources/SoftwareUpdate.icns' -timeout 10
		echo "$currentUser enrolled Mac into Early Adopter program."
		
	fi
fi

exit 0