512ke ...model number on those is M0001E, so there is a way to distinguish them from M0001W 512k machines.

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Of course there is. We've all said as much in recent posts. The Macintosh 512/800 has the model number M0001D, and the ED has the model number M0001ED Every Mac has a model number clearly specified on it's agency label or elsewhere, as well as part of its serial number – note the 512Ke's serial number ends in "M0001E". Early European models are appended with "P" denoting they are 240V models, such as M0001WP. However, since the case back is often switched or replaced, the serial number is the best way to determine how a particular Mac began life.