I agree with the general consensus about the state of channel aircraft. Its very unlikely, that there is anything mechanical worth recovering.
However, the main thing still left in the channel, are the airmen who went down with some of the aircraft. No matter the state of their aircraft after so many years in sea water, those men deserves to be recovered, or at the very least found.
I most certainly agree with your sentiments. As I have relatives still missing. They all should be found if possible and given a final marked resting place.