1:1,000,000 scale Contour Maps of Western Europe - Does this exist?

I am posting here as I understand this might be the right place for this query.

I am looking for terrain data - preferably in 5m contours - for a large area of western Europe: a diagonal strip from north of London to south of Rome. I realise that this is a very large area spanning several countries (and therefore mapping organisations).

The key point is that I only need this at 1:1,000,000 scale, so it can afford to be relatively low accuracy/detail. I realise that this might be an unusual request from mapping information!

I'd love to figure out a way to source the right digital data... but I am also open to the possibility of finding paper maps, scanning them and doing a vector line trace in Microstation (as I did a few times in decades past!). The purpose of this is to CNC cut a 3D terrain model representing a historic walking trail. It will end up being around 3m long by 600mm wide.

So... does anyone have any suggestions for how or where I might find such information? All ideas are very welcome. I am asking this here as I expect there may be quite a few highly experienced infrastructure professionals who read these forums. My hope is that one of you might be able to help.

Many thanks.

Chris