To be honest, I really do not know whether microneedling would help in this case - I actually doubt it. But there is no other way of finding out but giving it a try.
Buy a 1 mm dermastamp and stamp just a small part of the scar (as a test) every ten days to see how it reacts. You have to be patient because it will take many months to see results (if at all).
Microneedling does not remove scars but it reduces/smoothes them. Whether this would make the tissue stronger than the current tissue is really difficult to say.
After a revision, do not stamp sooner than 6-8 weeks later.
You may need a numbing cream because this area is very sensitive.