I place nearly all documented given name spelling variations in the Other Nicknames field. Then I mark any suggestions as False suggestion.
I do the same with alternate surname spellings, placing them in the Other Last Name(s) field.
The reason I include these names is to let other researchers know they exist, so they can find the relevant records.
If I were Data Doctoring this profile, I would follow my procedure and move the spelling variation to the Other Nicknames field and place the standard spelling in the Preferred Name field.
Of course, I would explain my changes, "moved spelling variation to nickname field; not proven as preferred name" - something like that (feel free to copy!).
And when the new suggestion for unique nicknames appeared, I'd mark it false.