for English i use heliboard. but i type in other languages also, and there are no practical choices in foss keyboards for those specific languages which also have the mainstream IME/key layout for my language (not qwerty).

fcitx provides some hope for the future but for now, it also doesn't have the IME/key layout for my language (only has qwerty). hopefully it can also have handwriting in the future somehow (if only via user-installed model/blob similar to heliboard glide typing).

anyway, I'm on Graphene OS. so i wondered if revoking network permission and setting gboard permanently to incognito (is permanent possible?) would suffice to cut off data collection?

edit: FYI the languages/key layouts i need are Japanese via 12-key flick and Cantonese via traditional Chinese handwriting input