You can emulate “convolution with a chain of dense layers” by using 1x1 conv layers.
Convolution with Chain( Dense(3*3, c1), Dense(c1, c2), Dense(c2, c3)) is equivalent to Chain(Conv((3,3), 1 => c1), Conv((1,1), c1 => c2), Conv((1,1), c2 => c3))
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