That's the challenge, though. For Crystal Cove, you could go in there at any time and single man it.
The Spectral Dragon Chamber can not be single-manned. And often, cannot be short manned.
The only solution I could imagine would be to allow additional entries into the Spectral Dragon Chamber, but to gate them with a dynamically updating window (kind of like a quest entry window) that shows how many others are clicked on the window and waiting for the instance. Once you have a minimum number (12, maybe?), it sucks you into the instance. That way you can be protected from not getting a super empty, short-manned instance (which is very frustrating when it happens).
Something like this, perhaps?
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