Horrendous idea from what I can tell of your description. Once a spoke is put into a wheel it's "done". It is used and not re-sellable in any way.

hold on - taking the time to try to figure out what it is that you are actually trying to do. ...

.....that one that's built...the hub is a cheap, cheap hub. There are a TON of "pre-built" CXP-22 rear wheel options available through your local shop. They can get them very inexpensively from places like QBP and J&B. Even with a shop markup you will still end up saving money.

In the future too it might be easier to just state what it is you are wanting in the first sentence: "I am trying to get a rear wheel with a CXP-22 rim. I found this .....which I can covert to a rear by doing...... or this........"

If what you want is an inexpensive rear wheel - there are a ton of options available to you.