Other than possibly disagreeing that the wise men were kings and that there were only three, what other objections would you all have to "We Three Kings of Orient Are"? To be fair to the author, in his day it was quite common to interpret Psalm 72:10 and a few other passages as referring to these men (see Matthew Henry for an example). Though I don't agree with it, I view this as interpretational matter rather than outright going against what the scripture says (such as putting the wise men at the manger, which this song does not do).
We three kings of Orient are
Bearing gifts, we traverse afar,
Field and fountain, moor and mountain,
Following yonder star.
(They were from the east and they did follow the star probably over many types of terrain)
Refrain:
O star of wonder, star of light,
Star with royal beauty bright,
Westward leading, still proceeding,
Guide us to thy perfect light.
(This is framed like a prayer, a wish, a hope, to find that to which the star guides)
Born a King on Bethlehem’s plain
Gold I bring to crown Him again,
King forever, ceasing never,
Over us all to reign.
(Uses the idea of gold to represent Jesus as King, which He is)
Frankincense to offer have I;
Incense owns a Deity nigh;
Prayer and praising, voices raising,
Worshipping God on high.
(Uses the idea of frankincense to represent Jesus as God, which He is)
Myrrh is mine, its bitter perfume
Breathes a life of gathering gloom;
Sorrowing, sighing, bleeding, dying,
Sealed in the stone cold tomb.
(Uses the idea of myrrh to represent Jesus as sacrifice, which He is)
Glorious now behold Him arise;
King and God and sacrifice;
Alleluia, Alleluia,
Sounds through the earth and skies.
(Sums up Jesus as King & God & sacrifice, and adds the idea of resurrection & praise)
I really can't find much to object to in this song, and the "3 kings problem" can be easily fixed by substituting the words "wise men" in place of "three kings".