Just a note, but deep diving air OR mix is a lot like heat transfer with large gradients. It is possible to pass your hand through a stream of molten steel with out burning it, provided the contact time is VERY short. Gas takeup is a lot like that in that it takes time forthe tissues and blool to load up enough to have an effect. Not much time, but some. The longer you stay the worse it gets, to a point. The first minute or 2 are critical howeever. A fast swim down to max depth, one breath there while taking a shot (photo or spear), then fast up to half max depth followed by a creep to the surface doesn't give time for much gas transfer on the deep side. OTOH this more related to working diving, not general rec scuba sightseeing.
Your DCS risk might be small, but there are plenty of other risks to compensate.
I remember chatting with an older instructor from Cayman once, and he was telling me about how every so often a couple of dive instructors will do a bounce dive to 300 feet on their day off. "We lose one every now and again," he said "but not as many as you might think."