The 'chuck key operated isolating switch' is a very good idea. We have a similar system on a large gantry router where the vises are near the edge of the table and the vise handles interfere with the gantry if they are not removed; the machine will not start until the handle is hung on its hook.
The springs on the chuck key I find sooooooooo frustrating; let go of the key and it falls out down behind the bed where it is difficult to reach.
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