Double up on speaker cables

Probably. But you should be testing the options and telling us what you found from the experiment. That's the fun. 

It will lower the resistance and not do much else the power will follow the path of least resistance. 

Interesting idea. Give it a try in all permutations and tell us what you conclude. 

My guess from experience is it may sound on initial listening to have the attributes of both. But you will hear a slight smearing of notes best heard on well-recorded triangle and cymbals. Then you'll notice it in other aspects of recordings until you can't unhear it. Always do A-B-A testing to confirm..

Your nice speakers (and you) deserve better.  Sell your existing cables and buy something that actually does what you’re looking for.  But by all means give this a shot — it’s free and you’ll probably learn something if nothing else.