Separate by each individual sticker/player. Just like paneled cards found on food cartons, box bottoms, or paneled inserts. If each panel card was always the same a Note could be added. For instance, using your photo of Series 1, Card 8. Add a Note to each players checklist entry (suggestion: S1C8). And define it in the Glossary as "Series 1 Card 8". That way a collector looking for an individual player would know what Series and Card number to search for.
I'd also use NNO and list them alphabetically.
Someday my cards may double in value and then be worth half of what I paid for them.