You don't need presence servers to register any endpoints. You can register endpoints either on cucm or VCS. VCS only registers video capable endpoints otherwise known as codecs. CUCM can register some codecs but not all of them.
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"The essence of christianity is not the enthronement but the obliteration of self --William Barclay"
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.