It follows that an engine may be de-rated and also be using reduced thrust in which case you could be taking off at Full power -20% -25% = 60% of the full power of the engine - scary thought!
Not scary if you contemplate that such a takeoff is likely to be on a very very long r/w, no departure obstacles, at a low gross weight. Why not choose a thrust appropriate for the situation?
Note that a T/O de-rate can overridden by firewalling the thrust levers
Now that
IS scary! Override a derate - and you're operating beyond the AFM limitations for that derate chapter. You've become a test pilot, and likely to find yourself below Vmca (or Vmcg!).
I'd NEVER try that OEI, unless I was WAY above Vmca.