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No need to fertilize in the fall/winter. Just maintain the soil as evenly moist as you can and mulch with 2-4” of organic mulch (no rocks). Stop watering if the soil freezes or temps dip below freezing.

You can. It isn't far off from what a Camellia will require. This article will help you to feed them:

https://www.gardeningknowhow.com/ornamental/flowers/camellia/camellia-fertilizer-info.htm

Dads quad can be transplanted when they go semi-dormant in the winter and japonicad -since they tend to mostly bloom in late fall to winter- can be transplanted after they bloom. Be careful with their root system, as they have shallow, tiny, fibrous root that only grow about 4” deep when planted in the ground. More info:

https://www.americancamellias.com/care-culture-resources/general-culture-requirements/container-grown-camellias

My sasanquas have/are blooming here in Hurst, Texas but the japonicas are still waiting; they bloom in late December to April. Camellias do not go dormant in the Texas normally. They just enter a period of semi-dormancy in which they retain all foliage and blooms. Because of winter is colder in Jan-Feb temperature-wise, they will be subject to be dormant at that time. Watch out for our typically wildly fluctuating temps as these may cause the plants to break dormancy just as a cold snap arrives. I lost one bush in February 2022 because it was blooming when temps plummeted to -2°F. Unfortunately, it is hard to say "when" they are sleep but they stand a better chance in Jan-Feb. Prepare the new hole ahead of time to minimize the time that the plant is exposed. Water deeply the night before and get help to move it if necessary. The more of the rootball and of the fibrous roots that you transfer, the less the roots will be disturbed. Disturbing the roots may cause flower bud failures and cannot be helped (other than by mulching and watering when a finger inserted to a depth of 4" feels dry). Remember that their root system is shallow, tiny, fibrous, like a pancake and grows about 4" deep only. Do not fertilize until spring-ish weather arrives in 2022, probably in mid to late March or April. Protect the foliage from air drying when transporting them (like if you put them on the back of a pickup truck).

The shrubs likely are not dead, but the leaves froze. Wait till spring and see if the leaves regrow. If the stems froze, you can cut back, but still wait till spring. Here is more:

https://www.gardeningknowhow.com/ornamental/trees/tgen/winter-damaged-trees-shrubs.htm

https://www.gardeningknowhow.com/plant-problems/environmental/tips-for-saving-cold-damaged-plants.htm

https://www.gardeningknowhow.com/ornamental/flowers/camellia/pruning-camellias-how-to-prune-a-camellia-plant.htm

https://www.gardeningknowhow.com/ornamental/flowers/camellia/caring-for-camellias.htm