Using Image Layer For Coordinate Reference Only?

Thanks for Inkcut!

I am looking for a way to use a layer (maybe) in Inkscape for reference only. If I have a square that is 100mmx100mm and place a 20mm circle somewhere inside the square, I would like for Inkcut to load the square starting at x0,y0 to help place the circle at its correct coordinates. I only want to cut the circle out of vinyl, though. If I select the Layer tab and deselect the layer which the square is in, the circle then moves to x0,y0. That doesn't work.

Thanks for any insight.