It would be a cool project, if one were to make an asm program that displayed all the available characters that would work within a string the the +'s would accept. To access the program for easy use, it would need a key hook, like pressing Y=, since most people wouldn't really need to access that from within the editor...
Then when in the program, just select the character, and paste to where it is supposed to go...
Then when in the program, just select the character, and paste to where it is supposed to go...