I hadn’t noticed this when I visited Sant’Angelo in Formis (I guess I was too focused on the frescoes,) but I did notice it the other day while looking though my photos. The shaft of the rightmost column of the porch arcade is elevated on a base fashioned from a drum of an antique fluted column, so not quite like the example at Carinola, (discussed here) but an interesting solution all the same.
I only have a closeup of the bases on the right side, but judging from the appearance of the leftmost base in this view of the façade, that too may not be a straightforward base. I’ll get a better look if I ever have a chance to go back. The façade view gives a good example of the combination of spoliate material in differing sizes and colors.