Yes you can use them as they are just wav files. Just be aware of the Hz they are recorded at since there is a range to chose from. Nothing particular but the length and tone of the wav file that is used.
If you move the IR, you will have to update your patch because the software doesn’t track it for you. It will just show a missing IR file or whatever you replace it with.
If your talking about through DAW only then yes, you would buy the Helix native (software) and then download HX Edit for free. If your talking about playing live and through a DAW for recording the pedal and the HX EDIT will work just fine.