You already have a pretty good spiritual experience set in place for your father.
The only thing I would add is the Chapel of Divine Mercy. I said the chapel when both my parents passed away. It has some great promises that have been approved by the Church.
What is Divine Mercy? - How to Recite the Chaplet.
From Sister Faustina's Diary:
Jesus told her: "Write that when they say this chaplet in the presence of the dying, I will stand between My Father and the dying person, not as the just Judge but as the merciful Savior." (Diary, 1541)
Earlier, our Lord said to her, ”At the hour of their death, I defend as My own glory every soul that will say this chaplet; or when others say it for a dying person, the indulgence is the same." (Diary, 811)
My colleagues may have other ideas.