To respond to a few points that have been brought up...
@Kettlebelephant yes I can do 10x10 in cooler conditions with the 32kg. It's only become a bigger issue now that summer is arriving.
To everyone else, all I'll say is that I've tried the chalk and it works a dream. It still works my grip plenty but it stops me worrying about my bell slipping due to humidity.
In addition, the only mention I can find of chalk in the Simple and Sinister book is something along the lines of "a little is good, but abusing it will tear the skin". On my first session with it I used a bit too much and could feel how it puts the skin in a risky position. Nevertheless, a little bit certainly did the trick and made the practice more enjoyable and will no doubt improve my consistency. Plus it gets the Pavel stamp of approval. That's all I really needed, as I'm not breaking any of the 'S&S rules'.
Also, as has been mentioned already, if 'Chalk-Free Simple/Sinister' was a goal of mine for whatever reason (FWIW I really hope that doesn't become a thing... this thread is only really a product of me overthinking things), achieving 'Simple/Sinister Plus' with chalk would probably be a quicker way to do it.
Finally, I definitely agree with the stance
@Anna C has on the comparison between chalk and lifting belts - I really don't think they're on the same level as one another. I mean, don't some people/lifters also use chalk as well as belts when deadlifting? If doing hairstyle swings with a belt was a thing, then I think that'd be more comparible.
Bottom line that I'm going by now though is that the rules on achieving Simple/Sinister do not say anywhere in the book that chalk isn't allowed, but does say that a little is "good". Having tried it myself now, I'll definitely be making use of it as needed.
I apologise for overthinking things...