Using bi-wire cables on non-biwirable speakers

Puting both on the binding posts works, but seems to mess up the imaging.

It seems as though I really should just purchase an inexpensive pair of speaker cables to hold me over until a proper replacement becomes available.

There is scant (but not quite zero) scientific reason for biwire connection to speakers that have separate connections for the woofer and tweeter crossover sections. There is absolutely nothing to be gained by running separate wires to a common woofer/tweeter connection.

I've heard some say running multiple similar cables between a single amp and speaker connection can make a big difference in sound (for the better). Don't some cable manufacturers like Nordost use a parallel multipath conductor design in their high end cables?

I don't think it can hurt to try. Try it both ways and see if there is a difference I'd be interested to know.

Having bananas at the speaker ends makes it difficult.

If you want to keep the biwire capability of the wires for later, I suggest swapping one of the speaker-end pairs (either one) of banana plugs with spades. Most binding posts will accept a spade and a banana plug with no problem.

Otherwise, if you're not planning to sell them and don't mind a little butchery, you can just clip the bananas, twist all the proper ends together and have a single "bare wire" connection.

You might even notice an improvement in sound when you get the connectors out of there. :)