Valve Alignment - simple over-travel fix ?

Is there any simple way to correct alignment over-travel BESIDES replacement of the bumper?
I am currently using small dots of 'stick-on' tape that has very strong grip, but I don't know whether it will last.
YHR-668N with round neoprene(?) bumper material.

My early results indicate better 'sound' and 'note accuracy' after better alignment.

Located in upstate NY near Binghamton  /  Ithaca

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Update May 2023 - the stick-on tape worked fine until recently when I got some valve oil on it - that caused the adhesive to soften and dissolve, causing the material to loosen and fall off of the rubber bumpers.
 

As the "bumpers" are the only thing controlling the range of movement of the rotor, I can't think of any other way of dealing with excess rotation than replacing them.

In fact, I can't see why you would not want to replace them, but perhaps there's more to the story.

And yes, it is important to get this right, using the "cut marks" visible under the dust caps.