I think our Papal recognition of the devotion of the First Saturdays as required by Our Lady of Fatima can be done differently. Our Lady only asked that these devotions should be spread in the Church and if by the Pope, it would be more effective and efficient. So, it is not necessary that the Pope himself would publicly proclaim. For example, he could commission the apostolic penitentiary in Rome so that they can issue a decree that every Catholic who is practicing the First Saturdays, according to these elements required for the message of Fatima will obtain a plenary indulgence.
This decree will then be approved by the Pope and this will indeed be sufficient enough as a papal approval. This could then incentivize, and this devotion will spread and will be practiced more; or in another way, the pope could start a public rosary and meditation in Rome on, let us say, first Saturdays, so that the people could come and simply make these practices together. The pope could do this or he can commission a cardinal in Rome to do this. This could also be a means of propagating this devotion.
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