I agree with the above, if you are spending all this $ just to get more tier miles, it would really suck to then end up not getting the status because of insufficient miles. So make sure you have the full amount needed.

With that being said, how often do you use the benefits of silver? Is it enough to justify the rather large additional $ / time to you? If yes, I would go for it and fly KHI-DXB-KHI on flex as suggested above. If no, I would just stick with saver Y to Europe and forget the mileage run.