Painting text on texture

Hello everybody, I need to position text on a texture. There are ~50 sentences, in different fonts. I do not want to make the text first in gimp and then using it as stencil for the material, it is a process too slow.

I have been using ArmorPaint until now (i am on Ubuntu) and it works quite good except that the text support is pretty limited. I can’t, for example, copy and paste sentences from a plain text file to the text input field, or I can’t, for example, saving the custom fonts in the project file.

Do you know if there is an a blender addon that adds text support to the texture paint workspace in blender? that would be perfect. Otherwise, do you now if there is a valid linux alternative to ArmorPaint?