I don't think they will be able to find one other than the other two they had.
Admittedly, there was an abandoned Canberra in RN markings at Melbourne Airport that I think ended up with Valiant Air Command, The Airport Authority got tired of looking at it and asked for bids. But that one was quite different from the WB-57F model, which has much larger engines as well as two more podded engines under the wings.
I recall a Shuttle launch that I worked that had a WB-57F come observe it for some reason. I thought it odd that it was flying even then.