Addiction doesn't mean one has to take something everyday. Anyway...
All the rivotril is doing is slamming on the brakes (GABA), by doing this your body is creating a dependency due to its inability to slow down after a week without the need for a drug.
What is the reason for the modafinil? You know your entire journey is completely up to you to navigate, with your belief system.. I used the top end of all stimulant medication for a number of years because I "had to", I had so many reasons why and they all made sense to me, family, psychiatrists, etc. As well as other psychiatric drugs.
There is another path where you can focus and control your nervous system positively and negatively without the need psychiatric medication, but it does require allot of work.
For some people a glass of wine or a whiskey at the end of the week is what they need, it sounds like what you need is a rivotril, I personally don't like to have to depend on anything and found it frustrating that I required external medication to balance my body and was more frustrated that I was not able to do it myself.
If you coming looking for affirmation that it isn't a bad idea long term then clearly that's the answer you looking for as well as the reasoning you find taking a stimulant doesn't seem to affect you, however it clearly does hence the reason for the rivotril because you sending 1 signal to turn on your nervous system and another to turn it off, and it's way to fragile to just play within that space without it going further than that in time or without it changing your character, whether it being more irritable, tired, less drive, poor sleep, eating habits, dependency, inability to do your job without "your pills", inability to turn off at the end of a week without "something", etc etc.
"Whether You Think You Can or Can't, You're Right"--Henry Ford