Populating A Combo Box With Integers In Hex

[Tristian Celestin <tristian celestin outlook com>]

I have a GtkListStore that contains 4 columns of unsigned integers (G_TYPE_UINT). I would like to display the 
second column of integers in a GtkComboBoxText widget, and I would like the integers to be displayed in Base 
12. 

Based on the GTK 3.10 documentation, the following will populate the combo box for columns of G_TYPE_STRING:

gtk_combo_box_set_model(GTK_COMBO_BOX(self->priv->comboboxtext1),
    GTK_TREE_MODEL(device_store));
gtk_combo_box_set_id_column(GTK_COMBO_BOX(self->priv->comboboxtext1), 1);

Is my only solution to add another column to the list store containing strings of hex-converted integers? 
Ideally, I'd be able to tell the combo box how to format a string it displays for each unsigned integer in 
the model.