How great! Thanks so much for sharing. 
Downloaded a couple to try out.

So far I tried to import with the Sadie cartoon figure, P4 female, and with both it hung Poser on loading the BVH.  On the LoRes girl from  3DU it worked.  Will try all other figures see what works what doesn't.

I have a free BVH Player named GG18bvhPlayer and it doesn't play with that, giving an error of Incorrect format in line2.

Will keep trying, but sure do appreciate the effort you went to. :)