Re: I could train 1st line to be fluent in 'user'
It's entirely possible they could have a form of dyslexia. Not all dyslexia is crap spelling and an inability to read because letters seem jumbled. There are also forms that result in similar words being substituted when writing. Eg "You can't see the wood for the trees" becomes "You can't see the wood for the forest". Ask them what they wrote and they'll say the first, ask them to read what they wrote and then they'll say "that's not what I wrote". That example also works for some really rare forms where even the spoken language gets mangled, think Spooner.