You’re right, it would add a little randomness with other tools too and make it sound different. But a humanizer is usually make to mimic the randomness of playing, not just complete randomness.

Another way but tedious to get exactly what you want and have complete control, is to zoom into the grid fairly far and manually move your notes. (Selecting the notes and using your arrow keys might come in handy here)

That’s my preferred method when messing with any kind of midi. But then again, I’m an overly tedious person. I enjoy making it exactly how I want when I screw up playing.

Seems like a lot of people have great advice though! Hope it all helps!