I have this same scope. It comes in two flavors, one with the hunting turrets, one with the locking turrets. I don't think you can have the one with hunting turrets retrofitted, but you can check with Zeiss. I asked them if they could do this to my first choice (2-10, which does not offer the locking turret option to buy) and this was not possible. So my guess is, this will not be possible, but again, check with Zeiss.
The other option you have is to send it to Kenton. They will install an exposed target turret on the scope for you, similar to Leupold's CDS system. I think the service is $125 plus the cost of the actual turret. The whole thing, as I remember, is 225. They told me they were looking into adding the capability of installing the Zeiss lockable turrets this year, but it is very involved, so they don't know if they will do it or not. The market is probably pretty small.
If they don't do this, it's up to you as to what you think you should do. Though I wanted the 2-10, I could not live with unlocked turrets for my uses. Most of the people I talked to said a general hunting rifle that could be used on horses, or africa etc. should not have turrets that could be inadvertantly dialed. Some had actually experienced accidental changes that caused missed shots. However, others said it was no issue. In the end, Mule Deer seemed to suggest it would be best to have locked turrets, as I understood him anyway. So I made that a requirement for myself. But that's me.
So in the end, I went with the 3-15 with the locking turrets. It's pretty nice. The clicks on the windage are very positive. Not so much on the elevation, but still decent. The locking function is great and gives good piece of mind. I wish they would put markings on the parralax adjustment, that's kinda annoying and will require me to work that out and mark it myself. Otherwise, it's a great scope.