Some of us (older pilots!) may remember using the Smith's Flight System, or it's military counterpart -the MFS or Military Flight System. It had a Pitch/Bank pointer instead of an Attitude Indicator. The horizon rotated on a fixed gimbal anf the pich pointer moved up and down a scale which had 18 degrees of up movemet and 9 of down. The compass element was known as a Bearing/Distance/Heading Indicator and the compass card coule be allowed to rotate as normal, or if flying an approach the runway QDM was set at the top and the aircraft heading bug moved round the dial.
If it sounds confusing, it's because it was! No doubt it was the bees knees of instrument design in the late 50s, but it had serious limitations. One being that in the Victor Mk2 where I flew with the thing, the aircraft could easily achieve pitch angles of more than 18 degrees and after that we had to use the ASI to monitor the pitch angle.
I'm not advocating it as a replacement system. It was rubbish! I just though I'd add it into the different systems discussion.