I am not sure he could create magic with it, but it would be interesting to hear him take another try at an anthemlike / epic number.

So far we have:
- Free (a first, bit hesitated try)
- Purple Rain
- The Ladder (a more gospelized Purple Rain)
- The Cross (not often called an epic, but i think Prince tried to create an epiclike song here)
- Anna Stesia
- Still would stand all time
- Graffiti Bridge
- Three Chains of Gold (his 'Bohemian Rhapsody)
- Gold
- Into the light (i know, its short, but it surely has epic elements)
- The Holy River
- Saviour
- The Love we make
- Welcome to the dawn (a stripped down, acoustic epic)
- The Last december (a bit prog-rockish)

Don't forget ---

1) Thieves in the Temple
2) 7
3) Thunder
4) Live 4 Love

Those songs sure have epic elements, but i dont really consider them rockanthems, because they lack the slow, ballad-like structure so 'common' for classic epics (i mean: think of Child in Time, Bohemian Rhapsody and November Rain, those songs are ballads 'blown out of proportion'.

Instead of the songs you name, i consider for example 'The Morning Papers' to be more epic-like.

and Computer Blue

Purple Rain, The Ladder, and Gold are quite certainly epic rock tracks. Not sure about the other ones you listed though . . .

I think Last December could fall into that category.