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What about buying a basic gypsy guitar - e.g Stagg/SX/Skylark, Ozark or Richwood - stuff it with foam, rags or anything which fills up the body and stops as much acoustic production of sound then add a pickup ( you might need to cut the top a bit to fit say a cheap humbucker or single coil ).
That way you get a reasonably silent guitar with gypys dimensions which will let you practice gypsy techniques. I susoect that there are few solid bodies which will match neck widths, scale length and string action to let you do that.