If you've unlocked root, there's another option. You can move the latest working GMS (10.0.84) to system partition and block auto-updates by creating empty folders with the APK name.
KitKat (tested):
· APK goes to /system/priv-app/com.google.android.gms.apk
· libs go from /data/app-lib/com.google.android.gms-{1, 2}/
to /system/lib/
· mkdir /data/app/com.google.android.gms-1.apk
/data/app/com.google.android.gms-2.apk
Lollipop+ (presumed):
· APK goes to /system/priv-app/PrebuiltGmsCore/PrebuiltGmsCore.apk
· libs go from /data/app-lib/com.google.android.gms-{1, 2, 3, 4}/
to / system/priv-app/PrebuiltGmsCore/lib/arm/
· mkdir /data/app/com.google.android.gms-1.apk
/data/app/com.google.android.gms-2.apk
/data/app/com.google.android.gms-3.apk
/data/app/com.google.android.gms-4.apk
(posted this on the »Google Play Help Forum« thread earlier)