Substitute for honey in this recipe

I follow a ketogenic diet and I personally wouldn't get too worked up about 1/2 tsp divided amongst several of these. If you really want to leave it out, I'd use a powdered sweetener (there are some that blend erythritol with monkfruit or stevia) or you could try stevia glycerite. Stevia glycerite is a little thinner than honey but it should work. Also, be aware that you will likely get a bit of an aftertaste and/or cooling effect when using stevia, erythritol, or monkfruit.