Scar and HT repairs are performed routinely by most top surgeons I know that Ron Shapiro also specializes in repair work. I would ask for a consult from the top doctors near your area for their advice.

Spex has a very detailed website of his experience and scar revision which you can view here: http://www.hair-help.co.uk/

There are typically two ways to repair a scar, One way is to add grafts into the scar to camoflague it while the other is to have another donor strip removed that contains the scar and seal it off with a tricho closure. The advantage of the later method being that you will have some grafts left over to transplant should you need to.
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