Sorry to hear you haven't been able to find a workable option.Update: I contacted and had awesome but also demoralizing discussions with the people recommended in this thread (thanks y'all). Scientific diving in Norway seems really strict, my team and I, have decided to focus for now on other areas of research.
The only workaround I found was volunteering as a diver for experiments in labs in other countries with different legislation, which we may have unofficial collaboration.
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Minor flame: Commercial divers are keep dying for being placed in underwater deathtraps. At the same time, any research that tries to minimize such deaths and requires participation of divers is in practice financially infeasible with horrific logistics. I hope that this blind spot, on a generally well organized and regulated country, would be illustrated at some point.
This was the exact situation in the 70's/80's that lead to the formation of AAUS to get an exemption from OSHA commercial diving regulations which are also highly biased toward surface supply. My understanding is the original standards relied heavily on recommendations from Bev Morgan (of Kirby Morgan), so there is some self serving standards in there from the hard hat side of the industry. There still isn't an OSHA compliant CCR due to the technology requirements in the standards.