33, by (steel base plate), do you mean the reed block or blocks? Very thin, very hard, light weight, magnetized steel reed blocks? As long as the weight of the accordion stays at 7 pounds or preferably less, I'd like to see such a thing be created.
As far them 9 pound accordions, they're overweight and sluggish. And they eat too much of my energy and play speed......much like a fat baby does to it's parents.