One approach (and likely there are better ways which others may share)...
Assemble the overlays only - no background - in the preview window, scaled and positioned as desired.
In the example below track one is the background image, track two is text, track three is the yellow .png button, track four is a high-contrast logo created by first keying out (green screen) the background, which was blue, leaving only the white clouds.
Right-click in the preview window and TAKE SNAPSHOT OF SEQUENCE. It will appear in the bin area (top-left).
Clear the timeline, or open a new sequence by clicking the + sign on the sequence 1 tab above the timeline.
Place the snapshot on the timeline. Apply the green-screen effect and use the eyedropper to key out the black background.
Right-click in preview and TAKE SNAPSHOT OF SEQUENCE.
Use that new clip to overlay future projects.
