Spagnum pear moss would be an excellent choice to help water retention and soil composition.
Top soil - there are virtually no guidelines on what can go into top soil that is purchase so steer clear from it unless you know where it’s coming from and what it is.
Could also add in some organic materials - alfalfa pellets, leaf mold, vermocompost to give them a shot of life.
You should be fine either double digging the beds or just amending the top 4-6 inches and not disturb the no too environment.
I’m using a similar no till setup and my composition is 1::1:1 peat; compost: and aeration material. I use pumice but it’s pricey if you’ve got a lot of area. Sand or lava rock would work also.
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