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Absolutely. I would recommend cutting it back a bit before you move dig it up (easier to manage, and it will do better when you move it). Just make sure that it is watered appropriately if it is in a hot spot.

Knockouts should do fine in big pots but do better planted in rose bed areas along the deck. No more than one rosebush per pot though as the root systems will otherwise get into a battle for water and nutrients that will cause them to strangle each other. For winter the pots will need to be moved into a garage or shed and insulated or the root systems will likely freeze. You may not have trouble with that were you are though. I am in Colorado and we do need to think of such things here! Be sure the big pots have drainage holes in the bottom as no drainage holes leads to root rot which will kill the rosebushes. If the pots have drainage catching saucers, do not let the water sit in the saucer more than 30 to 45 minutes after a good watering, as this too can cause problems with root rot.

Knockout roses are some of the new age of self cleaning roses which means you do not have to deadhead them to get new buds and blooms to come on. If you do pinch off the dead blooms, do so very close to the bottom of the spent bloom so as not to take a chance on pinching out the area where the new buds will form.

So very sorry to hear that..... I have had success with replanting rosebushes in such areas after letting the soils sit over winter and plant the following spring but only by removing the soils. I remove the soils in a two to three foot diameter circle around where the rosebushes with the gall were planted. Let the hole sit open for a couple days. If those days are hot sunny days, all the better! Then refill the hole with a good bagged garden soil and water it in lightly. Let sit over the winter and replant. Here is a link to an article on the crown gall subject for you too: https://www.gardeningknowhow.com/ornamental/flowers/roses/crown-gall-in-roses.htm