I've read a few posts about using various OT features and am thinking I need to use 2 stylistic sets.
I have a series that started out using two fonts created specifically for the use of special numbers. We are now combining the numbers from those two additional fonts into the main text OT font.
One set of numbers is used to represent line numbers in the original papyri and set within the text, a little raised off the base, a little smaller than a "regular" number. The other type is, again, raised but is raised and sized to different proportions. The second set of numbers also has a couple of special periods that can set as underdots to the raised letters.
I’m not worried about much else other than using them InDesign.
I’m thinking that each set of numbers should be done with a stylistic set as they don’t really fall into the other numeric OT features.