You should consider using STLWRT instead of GTK 2. According to its README, "the goal is to be able to run most GTK+ 2 and many GTK+ 3 applications using the same STLWRT library", so supporting both STLWRT and GTK 3 should be relatively straightforward.

Interesting read: https://ubuntu-mate.community/t/horrible-gtk3-gnome-ui-design-is-leaking-into-ubuntu-mate-applications-in-20-04/22028/57


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