Certified GKH Gardening Expert
You are correct. They will die outdoors in the winter in your area. Fortunately, it isn't impossible to grow these indoors.
About 200 watts of light will be needed for these, indoors. There are many ways to go about it, but that will be the light requirement.
Outside of that, container care will be relatively easy. This article will help: https://www.gardeningknowhow.com/edible/fruits/kumquat/growing-kumquat-trees-in-pots.htm