I try to avoid wire scars and have not had any worth worrying about. On one larger cascade where I split the trunk, wrapped, wired and bent I dis get a little swelling above and below the binding but I was aware of the potential so unwound before it got bad. Unfortunately the split has still not fully healed as a result of early unbinding but I think that's better than swelling.Have you had any deep wire scars? And how have you dealt with this?
Dealing with wire scars:
It is sometimes possible to grow them out but with slow to heal species like juniper it can take a while. You'd need to allow the tree to grow freely for a few years to get enough thickening to grow over the scars.
Turn a fault into a feature - would it be possible to strip bark to form a shari following the wire scar up the trunk? Following wire marks could look a little artificial as the marks are probably quite evenly spaced but it may be possible to take the shari off the wire marks in places to introduce some randomness.
Make other scars - I have started to thicken some other species in specific places by cutting through the bark in places where the trunk/branch needs some extra thickening. The scar tissue that forms adds extra bulk to the tree at that place but not elsewhere. Maybe similar scarring could disguise or cover up the wire marks you have?