How do you apply faux freckles over foundation without messing it up?

Hey! I need your help, because this makes me so frustrated every time!

I have freckles naturally, so after applying foundation I like to draw them on again :)
The problem is this doesn't work without tapping them in, to make them look good. But this ALWAYS removes my foundation at these spots or makes it look crusty :(
If I try to go over it with what little foundation is left on my brush, it completely removes the freckles.. I've also tried drawing them on darker before foundation - same problem..
And I tried putting on setting spray before adding the freckles, but either the foundation still looks bad/patchy/crusty afterwards or the freckles look bad because the freckle pen is clinging to the setting spray and tapping in doesn't work..

Does anyone have the same problem and figured out a way to solve this?

Thanks so much in advance <3