You may have a tough time getting this done. Last I heard, when I talked to them about doing this, they said that they will only offer feature upgrade services to the organization that originally purchased the radio and which has a current service/maintenance contract with M/A-Com. They said that without those
conditions being met, they won't allow any feature upgrades.
Personally, I'm hoping Harris publishes the feature encryption generator software on their website as a free download.
Elroy