I haven't criticised the proposal for that reason; My concern was that the position would be occupied by somebody who was active in fantasy politics, and would soon be looking for another position elsewhere in another election. My concern was that this would lead to a high turnover in a post, largely seen as a stepping stone, in a post that ideally shouldn't see high turnover. In the case of your choice, this is not an issue.
I wholeheartedly endorse John Dibble for the post and I am sure he will make a fine Magistratre.