How to create a PPA that just contains links to other PPAs?

So that I just have to maintain one PPA on maybe Launchpad and have all the packages I like.

Update: Nifty workarounds are welcome, too ;)

Update: I'm running a server here at home. So if there is a solution where I can set up my own private repo, that would be totally fine.

You can add PPA's in a script and excecute the script when you need to re-install these PPA's (for instance because of re-installing your system).

Example...

Execute from command line:

touch install_ppa
chmod 775 install_ppa
gedit install_ppa

and copy/paste your PPAs into the file. Rearrange your code to be efficient. Example:

sudo add-apt-repository ppa:tiheum/equinox
sudo add-apt-repository ppa:am-monkeyd/nautilus-elementary-ppa
sudo apt-get update 
sudo apt-get install gtk2-engines-equinox faenza-icon-theme equinox-theme
sudo apt-get upgrade
sudo apt-get dist-upgrade
nautilus -q

Put the file on a partition you do not format during installing or on a stick and you can execute the file thus adding these PPA's. You can also add downloads with wget in it to install tar files etc etc.

_{Commands have not been tested}

You could set up an apt proxy daemon on the server, something like apt-cacher-ng or apt-mirror for example (sorry, no more info, haven't tested it, but google seems to have a wealth of information about these packages).