What I suggest is put all of your letters in a long strip, tiled at a uniform size.
Use a SINGLE SPRITE and import them as animation, with speed 0. You can use the import animation panel to chop them up automatically.
Choose the frame number at runtime, right after creating the sprite.
This will be much more manageable, in terms of not having a jillion objects, no unwieldy text rendering and you get to control the letters behavior as individual sprites.