Do I need all three of those registrations?
no. rp_resources_filter is just needed for special handling of urls containing resources (probably not the case for you application), the ns_register_proc is not needed, since the revproxy handles the request.
. Do I need to worry about that?
no
I do not know when "re-inits" occur.
They should not. probably a left-over from old times, where nobody dared to remove it.
Great, that it works!