I plan, in the middle of next week, a little post on heraldic intercourse between Cardinals. Meanwhile, may I briefly float this: a laicised cleric ought to have the right to display his status armorially.
For Cardinals, perhaps this could be done by superimposing on the shield and on the galero a small escutcheon of the arms of S Gallen in Switzerland.
Any Bishops who, being heterosexual, have begotten children would need some small elegant charge which the heirs male of their body would be proud to inherit and to display. Ideas? A mitre, perhaps, debruised by a baton sinister?