Could this change the rinsing habit? Could this soothe the tension between the rinsers and the dunkers?
Europeans (Latins) eat differently. Anglo-Saxons are taught to leave something on the plate for Mr Manners. I was taught that taking a small portion meant that we could willingly accept a second helping and thus compliment the cook. A clean plate showed you had enjoyed it. At home it was expected that your plate would be wiped clean with a piece of bread. If you were "posh", you might put the bread on the end of your fork. (Not done in formal situations of course.)
In French, it's "saucer l'assiette". In Italian you use your "scarpetta", a piece of bread, (a little shoe) to clean up that last bit of sauce.
Even more fun, in Gascony (S.W. France) they "chabrot", a peasant tradition that is now followed only in historic or traditional celebration. Suggested not to be done on a first date or with your Aussie in-laws.
When having soup or a brothy casserole or stew, leave a little at the bottom of your plate. Pour in some red wine. Swirl the wine around to gather together all the juices and then drink, from the bowl, of course. Plate rinsed!
See an elegant demonstration...