You could just disable the Products Quantity box for this particular item. That way you can set the available number high enough that it won't sell out, but no one will be able to see how many actually are available. I've done that and it worked well. The only problem I had is that there actually was a limited quantity and I had inadvertently set the configuration not to show 'Sold Out' when it was. So I ended up selling a few more than I had, oops.
I set up a mailing list through my host for the second pre-order shipment so I could have a waiting list. I'll email that waiting list 12 hours before I make any announcements anywhere else about availability, to let those customers have first crack at the products.
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