I fear I still don't understand the problem. There has always been a speedo in MFN and you can see it by default. But the speedo I'm always looking at when driving is the one of my vehicle.
If I would use MFN's speedo only you're right in principle, but even if with Your suggested line break it would still be way too small. My favorite size then would be the same as those of the radar warnings and if so they must be kicked out of the standard field and shown as an overlay on the card, somewhere near the border, combined with a possibility in MFN settings to switch it off for those users moaning about cluttered cards.
BTW, You know that the size of the info panel can be changed...? And when deleting fields you do not need they even grow bigger. I'm always using MFN in landscape format and never felt the need to break the km/h line, even with the max number of fields.
Yes, I know that the size can be changed, but the position of the navigation arrow does not go up the value of the size change, which hides some of the navigation when you turn left.
But, you're right, if the speedometer was optional on the screen, it would be better.
I already suggest its position in the icon 3 positions, but I can not find the topic.