Managing a link network with Iframes (or other ways?)

Hi,

I recently inherited a package of approximately 120 websites that are highly aged and all are PR 3-4, and all of them are in my niche. They have all been sitting stagnant for a number of years, and are unused by my company.

I want to put them to work as my own private homepage link network, but want to come up with an efficient way of managing the links I put on them. Namely, a way that doesn't involve me manually FTPing to each of the 120 sites every time I want to make a change lol.

The easiest way to do it seems to be adding the same Iframe code to each of them that embeds a page that I would host on one of the sites with the links. That way, after the initial install, any changes to the links can be made just by changing the one source page.

Would this work SEO wise? Would big G treat each of these as separate pages with links, or since each of them have the same Iframe source, would it think all of the links are coming from just the one site that sources the Iframe (which would be a failure)?

Anyone have suggestions on the best way to do this?

Thanks