I like to think the first step would be to trying minor attacks to gauge the speed of humans fighting back. Such as sending a larger species to attack an important commerical tradeline. Sort of like if orcas started attacking ships in a place luke the gibralter strait. Starting with small sail boats eventually moving to sink larger vessels eventually crippling world trade by blockade.
I'm a side sleeper and I find them great. Used them in winter camping as well. If you get the winterlite pad, it really does work without an underquilt.
If you don't want to shell out for an Amok. Hammock camping for side sleeping does work. You just don't sleep aligned in the hammock like the guideline, but rather skewed on a slight angle to create a more flat sleeping position. It takes some practice but is can work for side sleeping or even chest sleeping. You just need to find the right angle so you aren't bent.
I hope the learning doesn't spread further, or gets more serious. Orca's are carnivores, and while they don't target humans, we are not so different from other mammals like seals, which they do eat. They have already sank muliple boats, it's not unforeseen for the life raft to get attacked, and for this to move from an unfortunate but interesting story to a very dark one, either for humans, or orcas.