[olddog]

I think the drop base filters are the easiest solution. You can have the intake milled off, at the carb mount, but requires pulling it off.

I used child's play dough. I set little spots of play dough all around the top of the filter. Then closed the hood carefully. That let me measure the gap between the filter top and the hood.

I just got home last night, from a two week stay in Strasbourg, France. Where are you located in France?