Anybody ever tried this little gizmo?

I am surprised nobody sees a major problem with the acc pump nozzle plate. It will affect distribution. Many production carbs had snivvies riveted to the booster to direct [ or re-direct more correctly ] airflow. These were muuuuuuuuuuch smaller than the 'plate', so goodness knows had bad that plate will affect flow/distribution. It also takes up quite a bit of area, so one would expect total airflow to be reduced, apart from the re-direction.
On well designed carbs, the acc pump squirt is aimed at the booster purposely to break up the flow....& atomise it.

However the above 'gadget' was designed & used by Carter decades ago.
Look closely at the pump nozzle on a CS TQ & the AVS Carter carbs used on Mopars. There is an air break in the pump nozzle that drags air with the pump shot to atomise the squirt.

Bottom line: something so simple & cheap would be in widespread use...if it actually worked.