Yes, you missed the point of FOP2 Manager, you already wrote your own, so you do not need FOP2 Manager at all.
Or, you can adapt FOP2 Manager custom functions with your own code, and use it instead of your own custom script/manager.
FOP2 Manager lets you manage fop2 users, permissions and install plugins, so it might be handy to adapt it instead of going with your own.
Best regards,