First, thanks for all your help in this venture into the unknown with the SL. Working out fine, as so many of you predicted.
Minimal but prepared is my goal, too. Don't plan to carry much on routine rides. Have the Topeak MondoPack saddle bag coming for a few tools and tire repair wherewithal, including the spare tube I've been told to carry for the tubeless Pathfinders about to be mounted.
Might be room left for some small incidentals there as well. The small frame bag will cover the rest of the small stuff. A bigger frame bag would start covering bosses, and I'll need all 3 if an RE comes into my life.
The only remaining item is a light high-vis mesh vest or long-sleeved solid shell. Since it's often hard to predict which I'll need, I often end up wearing one and carrying the other.
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For that, I'd like something more convenient and elegant than a stuff sack strapped to the rack (above). Thinking a small, low-profile rack bag — which nobody seems to sell at the moment. That's where your helpful list of custom bag makers might come in.