I have acquired a rather basic tablet for the simple purpose of writing. I am using different languages, amongst which Romanian.
Gboard has a Romanian language but the keyboards under that are not Romanian-specific, they are generic qwerty or azerty without the special characters ăîțșâ. (Looking at other languages I notice that not even French has a specific keyboard in Gboard, it's just a generic AZERTY, but that some, like Turkish, do have specific keyboards with special characters.) The same is true about other mainstream keyboards like Microsoft SwiftKey. These characters are available as many special characters by long pressing a i s t, but I am looking for a keyboard with the characters on top, like on layouts available on computers or even for Android external keyboard.
It is a Romanian-specific QWERTY layout, in Linux it is called "Romanian standard" or Romanian standard cedilla"
There are a lot of apps on the store claiming to provide that keyboard, but they are fake or otherwise misleading or full of ads. I am looking for a serious app, well supported.
I do have an answer myself, and I'm in part posting in order to provide an answer, but on the other hand I'm expecting better ones.