Since 2CD's structure is so closely related to DOM's is it possible to use 2CD as a precursor to synthesis DOM?

Simple answer - No! Not with the reagents and equipment accessable to you.

Wonder where the idea came from?

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DOM (STP): 2,5-Dimethoxy-4-Methylamphetamine. Again, simply the addition of an extra carbon to the chain to turn the phenethylamine 2C-D into the ampehtamine DOM. And the replacement of the Br atom in DOB with a methyl group would give you DOM also.

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Heh heh. Oh well.