There’s long MSE Division precedence for this and similar situations.
During my time on 280s (1996-2011) we usually had one LT(N) AHOD and two SLT Phase 6 MSEO trainees. For the most part, the subbies were fresh out of HMS Sultan’s applications phase and were new to ships. Rank aside, they went through the same qualification process as a brand new S3. That is, starting out as outside roundsman until deemed qualified, then progressing to the AMR then MMR before finally getting time on the console. At all times, they were taking advice and direction from their subordinates and were the better for it. Side ( and most important) benefit….they developed an appreciation for the tasks and working conditions that they expected their departments to face and overcome as HODs.
I assume (and hope) that this is still the case.