On m'a fait découvrir cette magnifique écriture créée par @imadetendrilis sur Tiktok, j'adore
This system could easily be expanded to work with diacritics as well. I've quickly sketched some possible shapes. Many diacritics work well in their usual form (dot, umlaut/diaeresis, acute, macron, breve), while others can be changed slightly to fit the aesthetic (grave, circumflex, caron, stroke, tilde, cedilla).
I see, I missed ogonek and comma. Maybe they could be the same shape as cedilla? Does any language distinguish between these?