Getting the water out will be a problem.

Sweating wet pipe is difficult if you know what you are doing. Trying it on
your first time will be a real challenge.

There is an epoxy made for copper pipe. I have only used it once where I
had no room to get a torch in, but it was pretty easy and hasn't leaked
after a year.

Just an idea. Of course, the outside of the pipe still has to be dry, but
the inside doesn't matter.