Some things you can do when you type (for ideas):
1. Instead of binding a key to our input map, you can also just get the input key code number.
2. You can translate that key code number into ascii, and from ascii into a-z, but you might need to detect the shift key separately with a bound key.
3. On that function, with every letter, you could spawn a sprite with a label attached to it with the letter and launch in through the sky!
I made this in 3d with a friend as a godot learning project, now I regret deleting all of it or else I could share all that code.