A separate security/system integrity chip? Something like that

If Motorola-Lenovo weren’t a bully with their update policy I would even consider it, maybe later if Calyx/Graphene support pops up

From what I gathered just now you can install any flipfont font from google play/aurora store, most of them are useless though

In most oem roms it’s an option, but in other aspects they tend to be worse than google’s walled garden even. From what I can remember Samsung and Oppo/Oneplus/Vivo/Realme have ability to change fonts but I wouldn’t put my trust and money in any of them