Goof-off worked to de-badge my car - the paint looked unharmed. I had first cut off the lettering with dental floss, as recommended. What ever happened to strong, unwaxed floss? I broke about 30 strips of some feeble teflon floss working for a half hour before the xDrive and 328i were gone.
But even with Goof-off, it took about another half-hour to rub off all the residual glue, not easy work, and my fingers are still sore.
I did order the black decals to cover the blue in the roundel, and a Mojave plate frame from Bimmian. And I'll remove those ridiculous airbag warnings from the sun shades as soon as I find a hair dryer.