You don’t need conlangs for that. Vietnamese does it. It’s another language that originally used Chinese writing system and then its own derivative thereof before the Romanisation came in that ks to Portuguese missionaries and then French colonialists starting in the 16th century.
Edit: although you could almost argue that romanised Vietnamese writing almost is a conlang, or at least a con-writing system, given how it was imposed on the language from the outside for the convenience of outsiders, and it has to really stretch to accommodate the Vietnamese language’s natural features.
You don’t need conlangs for that. Vietnamese does it. It’s another language that originally used Chinese writing system and then its own derivative thereof before the Romanisation came in that ks to Portuguese missionaries and then French colonialists starting in the 16th century.
Edit: although you could almost argue that romanised Vietnamese writing almost is a conlang, or at least a con-writing system, given how it was imposed on the language from the outside for the convenience of outsiders, and it has to really stretch to accommodate the Vietnamese language’s natural features.