Have you checked both /Library/Application Support/SIMBL/Pluginsfor all users and ~/Library/Application Support/SIMBL/Pluginsfor your active user?
Update 1 (no longer, see Update 2)
There is another potential solution to your problem. Download the code from GitHub and change the Info.plistkey value SIMBLTargetApplications/MaxBundleVersionto the actual version of your simulator (272 to your question). Create the plugin yourself and put it in one of the paths above (whatever your existing plugin is).
Update 2
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