I would also use Option 3. Both the WHO Annex 10 and Eudralex say:
at least one batch per year of product manufactured in every strength and every primary packaging
type, if relevant, should be included in the stability programme (unless none is produced during that year).
Based on that I do not see a problem with not placing 100st packaging if it is not produced. Placing a batch of 500ct bottles on stability for 2023 is more representative.