From my "back of the envelope" estimation, if you have ~1cm of slot below the bolt with the derailleur properly positioned for the 50, you should be golden.
Of course, I could be totally wrong, and often am.
What type of cassettes are you on? Is there a chance you could find a "junior" cassette that starts at 13? There's nothing magic about an 11.
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It's all fun and games until someone puts an eye out...
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