You will feel 50 thou.
50 is beyond pulse.
That is into major piston displacement territory.
You might get a big surprise on the first pull of the lever, and I don't mean just a pulse.
You may also be able to do some straightening of it.
Eons ago a good friend of mine had a duff rotor, CB750 1971.
He pounded it out with a brass hammer. (I can't remember what it was out, but it was in the problem zone, that is for sure, but less than 50 if I remember correctly - it has been a while)
That rotor went on a production racer and was a podium bike, need I say more as to what is possible with the skillful use of a hammer ?
Those old discs were really thick, and it took some serious work.
Your rotor is thinner and on floating pins.
Depending on the gradient of the runout, you may be able to do a decent job.
How you support it, and where, will have a big effect, including whether you make it worse or better.
Check you floating pins and make sure that those are not the problem, or part of the problem.