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The remaining hard part is having a convention that you know to encode, that future you will be able to decode, without ever explicitly writing down the code or indicating there is a code at all.
I will avoid the infohazard of solving that here, but I believe I am above the capability threshold required to do that on paper where my memory would otherwise be wiped, but not above the threshold where I could do this without giving this away in my conscious thinking at some point along the way, were someone else to somehow monitor that.
My guess is that Astra cannot jump straight to steganographic activity, but that if it was given a garden path to hill climb, and sufficient selection pressure, it would be able to do it. That we are not that far from this.