championed replacing turn coordinators and turn and bank indicators with a second attitude gyro. This makes a lot of sense and provides a lot more useful information
Umm... I must be missing something here.... A second attitude gyro in place of a turn co-ordinator, would leave you certain about the aircraft attitude, though not informed about the turn, or slip of the aircraft at all! The TC and attitude indicators do two rather different jobs.
I'd stick with the configuration which Cessna offered from the factory, when it comes to primary flight instruments....