Lapping is a well known solution,but not for this kind of reason.
The amount of silicon you will have remove is way to much .You will reach the circuit layers.
But ,you could destroy your accel.By lapping the surface,you may bridge some of the connection and if you mix the voltages with the ram adresses,then your accel will die.
Use the plastic wrap belt solution.It has worked for many,or buy your self some low profile ram modules.
They are dead cheap on ebay.
If it was only about your ram module,you could try it,but you can really destroy youyr accel.