Ya dun good. Loose lid in the fridge should keep them happy for a couple weeks anyway. I'd bring it out of the fridge and let it warm up before adding it to the Skeeter Pee.
Was this slurry from the very first racking of the wine or was the wine finished fermenting. For a good slurry, you want to collect it while the parent wine is still in an active ferment. If the orange wine had finished fermenting, many of your yeast will be dead or dormant and the slurry will be much less effective.