You can do the same with a Sharpie. All inks contain a solvent for their pigment, so you can use the same marker to remove the same ink. Just mark over it and immediately wipe it off.
I've had fewer than a dozen episodes starting last year. Luckily, like you, I have scintillating scotoma without headache. I haven't noticed a trigger--they're just spontaneous. A couple of years before, I had a couple of episodes of binocular diplopia (https://www.yalemedicine.org/conditions/double-vision). Dunno if they're related.
While developing the syntax for a programming language in the early 80s, I discovered that allowing spaces in identifiers was unambiguous, e.g., upper left corner = scale factor * old upper left corner.
I have sleep apnea that I treat with a BiPAP machine. The neurologist who manages it said that everybody has sleep apnea to some degree, and, as a matter of fact, with my BiPAP machine, I have fewer episodes than the average person.
Sleeping on the left side allows the stomach to operate better while sleeping on the right favors the heart. I'd always heard this, but recently read a short article confirming it. Dunno if it's true, though.
I had a boring class in junior high school where we had to write down everything the teacher said. To make it interesting, I’d translate the teacher’s English to really bad German and then write it in cursive backwards. I can still write backwards cursive without thinking about it much. The thing is, these days, I hardly ever need to write. About the only things I write by hand are the rare check and my signature.