Make a for/next loop with JMP/LBL pairs.
I was trying to think of a way to make FAL work. If you copied it to a SINT array with a file COPy, and then used the expression A XOR (B XOR(A XOR B)) (bit hack for a byte swap) and then copied it back to the DINT array so you had whole words you could probably get it to work. But with all the copying I think a for/next loop is the way to go for a large array. For a small array just brute force it, its simpler.