In reply to tlm:
Prior to the last two trips to the Anti Atlas, (most recently in Nov-Dec 2022), BMC insurance was my automatic, go-to choice. However the increased cost, as mentioned above, made me look for other options.
For both of the most recent trips, I've joined the AAC and have then taken out top-up holiday insurance with another provider. (I do have travel insurance as part of my home insurance, but Morocco is excluded. As always, it's worth checking the small print!) Other fellow members of our Anti Atlas group did the same, increasingly so for the 2022 visit it seems.
Having now joined the AAC for 2022-23, I intend doing the same for my next trip in a few week's time. Otherwise I'd be seriously researching Sports Cover Direct, either for a comprehensive policy or as a top-up, as both are offered as options.
HTH
Dave