@inflib: Yes. The Buddha said that the best way to overcome cravings is to think about their bad consequences.
inflib said: “So, would this be a form of kusala kamma as it is eliminating defilements? Does it matter that I’m the only one benefiting from it?”
– Of course. Each person can only cleanse one’s own mind.
Johnny_Lim said: “Does it imply that during the last moments of death of an Arahant, he/she would not see any nimitta? Or does he/she still see nimitta but is unfazed by it?”.
– It is the latter. An arammana (or nimitta) comes to the mind based on what types of kamma beeja are there. An Arahant would not grasp any.
A Sotapanna‘s mind would not grasp any nimitta corresponding to a birth in the lowest four realms.