Is this really necessary? Idont think there is a snowballs chance in hell of the Monarchy being restored.. so why go on using the titles?
Not necessary, they are and remain
prince (princesse) d'Orléans but it just a positioning inside the very wide web of capétiens: traditionally sons and daughters of the King and of the Dauphin were
fils (fille) de France, later
prince (princesse) de France.
Current princes and princesses de France
Isabelle (1932) x Friedrich-Karl Graf von Schönborn-Buchheim
Hélène (1934) x le comte Évrard de Limburg-Stirum
Anne (1938) x Carlos de Borbón-Dos Sicilias, Duque de Calabria, Infante de España
Diane (1940) x Carl Herzog von Württemberg
Michel (1941) x1 Béatrice Pasquier de Franclieu x2 Barbara de Bosch-Pastor
Jacques (1941) x Gersende des ducs de Sabran-Pontevès
Claude (1943) x1 Amadeo di Savoia-Aosta, Duca d'Aosta x2 Enrico Gandolfi
Chantal (1946) x le baron François-Xavier de Sambucy de Sorgue
Marie (1959) x Gundakar Prinz von und zu Liechtenstein
Blanche (1962)
Jean (1965) x Philomena de Tornos y Steinhart
Eudes (1968) x Marie-Liesse des ducs de Rohan-Chabot
Gaston (2009)
Antoinette (2012)
Louise-Marguérite (2014)
Joseph (2016)
Jacinthe (2018)