I'm wondering what you mean. Are you simply suggesting use of Y cables for XLR applications versus splitters? That has already been done, and I have reported on it.I was thinking of dual input connections... Another thing to try would be if running single ended, to put the signal through one cable and the ground through the other, with the shields only connected at the source end.
The additional capacitance of the extra cable seems counter-intuitive, so my musing was looking for a different explanation.