I did a little experimenting with a variant of toner transfer that uses polyurethane to dissolve the toner and bind it to the surface instead of heat. I was getting some transfer to occur, but only some, and the results were very ratty looking. But that was just a couple of attempts. Continuing practice might have made perfect, but I switched instead to a variation of Ray Wilson’s method for making panels: He used contact cement to glue a laminated printed piece of paper to the panel, I use spray adhesive and instead of laminating the paper I cover the printed side after gluing with self adhesive clear plastic. The spray adhesive’s less messy and the single layer of plastic makes the panel much thinner than lamination (which made it so thick I had trouble screwing on 3.5 mm jacks). Here’s a recent video about my process.