Fedora :: Updating A System That Got No Internet?

I have a number of systems with Fedora on them, they are connected to a network but are not allowed to connect to the internet. So I am trying to find a solution to patch these systems in a simple way.My solution which i thought of, however, still having a problem with is as follows:

1- Download the files from the "repodata" (e.g. for "update" repository) using a machine that is connected to the internet.

2- Copy these files(e.g. using flash drive) to one on of these Fedora systems into the /var/cache/yum/i386/12/updates (or /var/cache/yum/updates for older versions).

3- Run "yum -C check-update" (-C so it will not try to update and will use the local files). (I am having a problem at this step and I get this message "no such table: packages", the solution that i found on the internet suggested cleaning the cache which is not what i want to do!).

4- After getting the list of needed files I will parse the primary.xml.gz file and grab the actual file names then append the base URL to them and save it into a file.

5- take that file to the online machine and run wget to grab all needed patches.

6- Take the files back to the system and put them in (i think /var/cache/yum/i386/12/updates/packages/) and run "yum -C update" However, now i am having a problem with step 3 and also not sure if step 6 is correct.

So does any of you guys know how to solve this, or if there is a better or easier way to do this??* Keep in mind that those machines are not allowed to connect to the internet or even connect to another machine that is connected, but we still need to patch them and keep them secure.