[ketNavatutt]

When the Buddha says we should see, "This is not me, mine,self, etc", it is just one of several devices he suggests that we can use to detach with, to cease clinging to things.

What you say about how we originally tend to see the world vs how the Buddha suggests we view it in order to let go is in accordance with the Dhamma, but calling it "conventional" and "ultimate reality" complicates it unnecessarily and opens the door for the sort of misinterpretations we see in several sects that claim tthat this teaching *is* about alternate realities.