From a priest reader:
I have a liturgical question for you. According to the Ordinary Form, do you know how a funeral Mass is celebrated on Sunday? Are the Proper Sunday readings and prayers used, or those for a Mass for the dead? Neither the Instiutio nor the Order of Christian Funerals give an answer. Thanks for your help!
First, people should know that funerals can be celebrated even on Sundays, except if those Sundays are solemnities. For example, you cannot have a funeral on a Sunday to which Epiphany has been moved.
In this case, I am supposing that you would use the Sunday readings and prayers, for the most part.
However, given that in the Novus Ordo just about anything can be substituted for anything else "for pastoral reasons", perhaps you can use the requiem readings and prayers. After all, you can celebrate All Souls on a Sunday.
Perhaps some priest readers out there have faced this and know what to do.