I haven't read anywhere about provisions or suggestions put officially in place for the benefit of those who use the EF and who, praiseworthily, might wish to associate themselves with our Holy Father's Jubilee Year of Mercy. If somebody else has heard of official suggestions, perhaps they will share them with me and their fellow readers.
The Mass Pro Remissione Peccatorum seems very suitable and even refers to knocking at the Holy Door! (Under the 1962 rules, one can't say Votives in Advent or Lent.) Any ideas?
The Appendix pro aliquibus locis gives, in July, a Mass of our Lady Mother of Mercy, consisting simply of the Common Mass Salve with a proper Collect.
My own Anglican and Patrimonial instincts incline me to remind you of the Litany, or Litanies. Perhaps of the Quarant' Ore?
Any other ideas?