Something like this comes to my mind:
onesync_required 'no' -- default, set onesync_enabled 0
onesync_required 'yes' -- set onesync_enabled 1
onesync_required 'infinity' -- set onesync_enableInfinity 1
onesync_required 'beyond' -- set onesync_enableBeyond 1
If the server does not matches the OneSync setting, a message like this will be shown:
"Script {placeholder} requires {OneSync/OneSync Infinity/OneSync Beyond} but is not enabled on this server"