Just after getting the 2.3.6 ota on my USA import Nexus i9020a I decided to try the Google Wallet files from the NS4G 2.3.7.... They worked. I even could add the prepaid 10$ card and i'm on SaskTel in Canada .
Attached is a flashable zip that should work on all i902x models (i can't test it since i'm in Canada).
Install Method: Unsigned, must flash through ClockworkMod Recovery.
Compatibility: i9020A/i9020T/i9023 (2.3.6)
Other Roms: It may work on roms other than the 2.3.6 ota but if it doesn't just remove the files listed below via ADB.
/System/Shopper.apk /System/Wallet.apk /Lib/libshopperimageutils-3.so /Lib/libshoppervorbisencoder-2.so /Lib/libshopperzxingutils-4.so