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Some ideas from me. I will be potentialy out of internet contact in a few weeks so may not be much help.
Have it as another tab on the tabs already on GA pages
Specifically go out to recruit people, either dropping personal notes at talk pages, wikiprojects and the signpost (maybe even a watchlist header if you can swing it)
Advertise it as purely to get inexperienced editors reviewing. Make it clear that there will be help right the way through the process and they can't really make too much of a mess.
See if you can get some regulars who are willing to have their articles reviewed by these new reviewers. That should help alleviate any biting issues. The bonus for the regulars is that they will get there articles reviewed faster.
I would not treat this as a way to clear the backlog, but to get those reviewers who have considered reviewing, but were a little unsure whether they could. This has the added bonus of increaing reviewer numbers (and so reducing the backlog) and making sure the new reviewers devlelop good habits from the start.
End of ramble.  (talk) "