I'm pretty sure that in most congregations the entire bridal party is expected/required to be members 'in good standing' or else they will not allow a KH ceremony.
My unbaptized brother married a baptized & active JW about 12 years ago. Because the future daughter-in-law was not marrying 'in the Lord' (my mother's son), my mother was advised to go to the Courthouse Wedding. Two days before the wedding mom got the OK to attend. (She was pissed and hurt that noone wanted her suggestions about cake, flowers, and catering.]
So the simple concensus is: NO. Definitely not allowed in KH. Go to Justice of the Peace.
-Aude.