This thread talks about cleaning chillers. From CFC to IC. https://www.homebrewersassociation.org/forum/index.php?topic=17949
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You have to know the one sheet method though.
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I really like this, it's worked great for a couple years now.
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The primary fermentations are done in 3 days, which is fairly typical for ale breweries.
If the vials are fresh, you don't really need to increase cell count. Assuming this is a 5-6 gal batch, you'd want around 250 billion cells versus around 200 billion in two vials.
To activate the yeast, I'd just boil and chill a liter or so of tail runnings and get that on the stir plate until you're ready to pitch.
I vote for sprinkle without hydrating. I've tried both ways, and my sprinkle batches are every bit as good as my hydrated ones. I've stopped hydrating for simplicity's sake.