Then use caissons and hyperbaric chambers; Mine the old fashioned way. You could make a floating island to service the system; They can be quite cheap https://ventivefloathouse.com/
Without getting into whether or not this technology that you're bringing up out of no where is the panacea to all the problems with seabed mining that we're talking about, what sort of mechanisms do you propose we use to ensure that the people who mine will use these safer technologies?
