If you have copper pipe the valves may be solder on and you are correct that the line would cut in the crawl space. A short piece of pipe would be soldered to the new valve, pushed through the wall and reconnected.
Your present valves may however be screwed on. In that case it can be unscrew and an new one put on.
If you have iron pipe that would also be the case.
There is a hose bib (a faucet) called a frost proof faucet. These are simply faucets that are long enough to reach through the wall to the crawl space. When it is turned off, the water is turn off inside the crawl space where presumably it doesn't freeze. Unless you are in an extremely cold climate and it freezes underneath your house you shouldn't have to do anything to protect it. However, you cannot leave a hose connected during the winter because the hose will prevent the faucet from draining.
If you are hiring someone to do this, let them purchase the material. If they know what they are doing, they will know what they need. Sure they will probably mark them up some, almost all do, but that's part of their pay. You purchasing the material (unless they request it) smacks of you trying to short change them.
PS
Using all capital letters on the internet is considered shouting.
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