I hate to discourage anyone but your printer efforts are not going to work.
The powder will form a solid layer over the ink,with no break lines in the powder you won,t be able to simply remove the powder covering the ink.
Also chemicals that affect powder attack it at the adhesion point starting from the powder edges and creeping underneath to release the bond. Let us not forget that you will need to get the xylene through the powder to remove the toner. My suggestion is to print onto the powder instead of under it or clear powder over the toner.
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