Perhaps the color of that single half-link won't make a big difference. It will be easier to find on the chain.

Z410-OL - KMC Chain

But, it is odd, the selection.

This one comes with the silver half link as part of the chain, which would just seem natural as part of the design of the single-speed chains.

Z510HX - KMC Chain

Of course, you were using the "super-light" version of the chain.
K710SL Silver - KMC Chain

I think I'd still tend to buy the half-link chain, and start whittling off pieces. Or... how much do you have to shorten your chains? Perhaps use the half-link chain, and re-use all the extra half-links.