[JoeA]

I guess I am asking for a radio altimeter in all aircraft then.

What are the wonderwoman gauges ?

Ctrl F1 and you get a panoramic no-cockpit view with 4 generic gauges on the bottom, speed (in true air speed TAS - KMH) and altimeter (true height above ground) on the left and an artifical horizon and compass on the right. You also have the gunsight in the middle.

So you can always have a "radio altimeter" in every plane, problem is you do not have any obstruction from the cockpit.