Recovery of ABB Vetco Gray SG5 wellhead from template

We are planning to decommission some North Sea platform wells drilled around 1995/96.  The wells have a subsea ABB Vetco Gray SG5 wellhead landed into the template.  The wellhead has a locking mechanism allowing the 30” wellhead housing to pass into the subsea template but stopping it from being pulled from the subsea template.  It is our understanding that it may be possible to over-pull shear pins to allow the 30” wellhead housing to be pulled free of the subsea template.  We were wondering if anyone has any idea of what sort of overpull may be required and if anyone has successfully recovered from a cut below the seabed with this type of wellhead after a significant amount of time installed.
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