I have done a ton of houses with these windows. I normally do not charge extra. but it would be really good if you can.
Here is what i tell the home owner before removing any.
“we will need to remove these decorative panes from the window. we are extremely careful, although we have done houses before where these things literally just fall apart in our hands. I want you to be aware of the potential of them breaking”
or something like that. then if you can, have them sign a waiver removing you from guilt if any break.
those things suck. have fun haha