Unfortunately, as far as I can tell there is no single (or a reasonable number of) package containing all the dependencies. This is not because of Zenoss but because of other pre-requisites or dependencies like RRDTools, Nagios plugins and many other dependencies of these dependencies.
Technically speaking, you could work your way out by downloading every package as it is needed but it will be horribly long and tedious job.
In my opinion you would make a better use of your time and skills trying to figure out a way to get an Internet connection, even temporarily. After all you will also need to apply security updates to your system so this could be another good reson for Internet access.