Centaurus,
Look at the A380 - only reversers on #2 & #3. Just enough to claim the "major means of deceleration" for certification but really a WOFTAM.
The concept of testing reverse thrust prior to each takeoff is simply risible - where do you stop testing? Reversers and brakes worked fine last landing or there would be a tech log entry so just fly the aircraft FFS and not try to do block overhaul each T/R.