Bi wire into single input

What do you mean by single wire on the high’s?

They all hit a single point somewhere… either inside or at the post(s).

Whether they work or not will not likely be a consequence of being attached to a single post.

Nothing is crazy if it can be auditioned on approval.

I would imagine that the operative part is that they are good quality. But like all cables and interconnects, it will depend on how they actually sound in your system. Unless you know the “sound” of the cable and know it is complementary, i wouldn’t buy without the option to return. 
 

Also, bi-wires are made to put one on the high frequency and one on the low frequency connector.  ??