Do we really need to spend time trying to build this guy into another position, if he is not a true FB? Why wouldn't we be better off to let him go and bring Omar in as a winger/cover fullback? There is no need to teach him to be a winger as he was a wing prior to becoming an incredibly talented defensive and offensive FB.
I can't see a purpose in trying to
taylor him into a centre either. He doesn't appear to have a defensive mind, and we already have plenty of defensively weak centres to call on. We need a strong defender who can work on their offense, not vice versa.
I also think it would be foolish to move Locke to 5/8th in order to get Fish into the team. While I believe Locke could have the skill set needed for the new role, it would weaken our defence too much by putting Fish at FB with Locke in the halves, and we have options for 5/8th already.
I see no purpose in retaining him with any serious ambition of him moving up to first grade, it is just tying up money. The other option is to retain him on a minimal contract as our Vulcans FB. But he is definitely not worth first grade money playing in th Vulcans. He would be better to take his skills to another club who could use him more than we can.