Pin Chuck

Just a thought but have you checked other sources than Dremel for 1/8th shank mounted stones? The line of Dremel brand ones might be limited but there are other sources (I think). There is also the possibility of using 1/8th shank carbide burrs instead of stones.
To my mind making a 1/8 to 1/4 adapter for your pencil grinder would be a last resort.
 
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