errr sort of.
You been drinking that cactus beer again?
I think if you have the subs wildcarded, and it all points to the same vhost, then you can htaccess rules to the subdomain level.
Hmm? How does one "htaccess" to the "subdomain level"? No such thing.
but yes, to get a user to see a different site you would have to do a 301.
Then where would that redirected subdomain go? Back to the main doc root, because, in your
example, subs are wildcarded back to the same "vhost". (Infinite loop I think)
It can not be done with htaccess.

Bompa