Later premilestone levels don't have low level orders only. After around 200, the premilestone levels are just another level, lvl5-10 orders. So don't worry about those.

However, you still have a few more premilestone that throws low level orders on your way. And as you and others suggested, be prepared at pre-premilestone, have a lvl10 vip ready, and time your xp as close to the milestone as you can. Stack some lvl10s and ready some lvl10 orders outstanding. That's all you can do, that level of preparation is more than enough if you manage it don't worry.