I agree with the votes for an App. But I dont think you would have to download everything locally to use an app.. make it configurable so you can specify a server that stores OEMs and have maybe a file at the root of that server this program would use to display what OEMs are available and then when checked would download them as needed, and maybe keep local copy of OEMs for the last baked rom and a config so you could just reload it and tweak it if needed.
-D
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