So something strange for me - I got the device initialized using the fix in this thread, but couldn't get the card added. Uninstalled Wallet, changed my build.prop back to normal, and rebooted. Did the whole thing again (changed build.prop again), only this time the device wouldn't initialize. Uninstalled, reverted to normal build.prop, rebooted again.
Just for S's & G's, I decided to try Wallet again. Opened it, updated it through Play Store as it asked, then opened it again. Got to the legal screen and for some reason decided to scroll all the way to the bottom, then clicked I Agree. And it initialized very quickly. I still can't add a card (that keeps timing out still), but I double-checked and my build.prop is saying jewel.
Could they have fixed the initialization thing? Did I get dumb luck? Or does scrolling through the legal crap actually do something...?
EDIT: Eh nevermind, just get stuck at "Validating device" or whatnot after a reboot. Ignore this post