Is it too strange to allocate stylistic sets 1–13 + 18–20, leaving 14–17 reserved for future use? I'm also thinking about compatibility of sets between members of a family that differ in available sets, and a bit about making the numbers correlate to the feature they activate in a mnemonic way (however weird that sounds).
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If it is done to make members of a family coordinate... well, I have done that myself.
Although ... if convenient, I am inclined to arrange the sets so as to put the non-shared styles at the end. And also to group the non-shared styles so that the ones that are held in common for given subsets of styles are consecutively numbered.