Why?
While the disk is disabled, it is not used at all. It is emulated by the parity calculation by reading all other disks. So, moving files from the disk is actually working all of the disk harder than usual, and your array is currently unprotected since you only have single parity and a disabled disk.
Also, the whole point of rebuilding is to get the disk back with all of its data intact. So, you are only making your system work harder, and you are unprotected until the rebuild is complete, and you are delaying that rebuild.
Your data is actually safer if you go ahead with the rebuild instead of moving data from the emulated disk to other disks in the array.