This method ended up giving me much CLEANER results, QUICKLY. Instead of waiting 8 to 24 hours (as with Liquitex and ModPodge), I found that I could do the "rub process" within a couple of hours... sometimes even faster, depending on humidity.
The secret ingredient? ACRYLIC POLYURETHANE (aka "Polycrilic" or "Poly finish")
After the video was posted to YouTube, I started getting some great feedback. If you try this printing-on-wood technique, please let me know! Also, if you come up with ways to enhance this technique, feel free to share.