I don't think you can rechamber .44 spcl to 44wcf unless you put a liner in the chamber. I'm thinking the neck would have to be too far forward. Not positive, thouigh, and I have nothing available at the moment to measure.
Since there are a lot more 44wcf rifles around than 44 spcl, I wonder if you might find someone who wants to trade?
Whatever you do, good luck!
On second thought, you could also rebarrel the rifle (that is the only change needed) and then sell your original barrel.