tweak.xm

%hook SBFLockScreenDateView
-(NSString *) customTimeNumberingSystem {
  return @"<STRING HERE>";
}

-(void) setCustomTimeNumberingSystem:(NSString *)arg1 {
  %orig(@"<STRING HERE>");
}

-(id) initWithFrame:(CGRect)arg1 {
  id orig = %orig;
  // objectForKey may need to be used instead?
  [(NSString *)[orig valueForKey:@"_customTimeNumberingSystem"]] = @"<STRING HERE>";
  return orig;
}
%end