You could make some fret diagrams using the online generator at

http://sniff.numachi.com/~rickheit/pm/chord/chord

then save them in some graphic file format, copying the ones you want. Keep them handy somewhere and copy/paste into your staff notation file.

(I know how to do that on a Mac - does Noteworthy generate an editable image file?)

Rubber stamps would be a lot quicker if each score page is a one-off.