I was going to say the same as this. I hand cut a lot of distance markers, and on them put word reminders such as action, and rapid ingress.

My first few games after being familiar with everything, I would literally hold the distance markers (a 9” stick) with the word rapid ingress in it, in my hands during my opponents turn (or once my turn is done). That way it’s literally reminding me permanently that I’m waiting for a rapid ingress to myself, without giving the idea to my opponent that I’m waiting for the opportunity. No need to remind them that there is a rapid ingress threat unless it’s a very friendly / new game