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First a couple of minor corrections. Hope they don't seem pedantic, but you may be a bit confused about a couple of things.
Alignmaster doesn't help with drift alignment, it helps your polar alignment. Drift alignment is another method of polar alignment completely.
Drift alignment doesn't require a star to the south. You use one on the east/west horizon to adjust your altitude, and one straight overhead for your azimuth. If you have some trees, I still presume you can see at least one horizon reasonably low? And you'd definitely be able to see straight overhead?
To answer your actual question, follow the link Dave gave above and you should find that you can add in more stars as needed.
That being said, you should be right just drift aligning? I think most that use Alignmaster do it to quickly get close polar alignment, then follow up with a drift alignment anyway to get more accurate. I know I do.
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