If you are using a compression joint, It must be accessible. I guess you can make a removable panel if need be where the joint is.
I would never recommend hacksawing; using a mini tubing cutter will give a clean cut and allow the ease of putting the pipe back together.
Soldering a new joint makes the problem a situation that disappears for good. A compression joint has the capability of pulling apart and/or leaking.
“Your best interest is secured by making the right decisions the first time.”