This idea works best on a painted door. (New glazing muntins on stained doors have color disparities).
A glassworker supplied custom dimension bevel glass panes for the existing panels on these two six panel doors.
With very sharp tools I very, very, very carefully split off the muntin section from the one piece molded rail and stile, removed the panels and inserted the glass.
A little touch up paint on the reattached muntin pieces and a dramatic difference inside and out for this entryway!
Try it, you will like it!