We have used http://github.com/opinkerfi/okconfig
internally, you might be able to use (or modify) it it to suite your needs.
* Create host + 'default' services in nagios for a standard linux or windows host
* Log into the host and install nrpe + default set of plugins
If okconfig is installed, adagios will have some frontend support for this, but you probably want to wrap okconfig in a shellscript.