I thought I would give an update as a service to anyone else in my situation.
I sent my regulator to a Dive Rite service center which assured me it services all regulators. It discovered that, despite what I had been told by former Salvo personnel, there were no comparable Dive Rite kits. They did a search and found nothing.
They contacted Corey Mearns of Light Monkey, formerly of Salvo, and he said the regulator was actually made of a couple of different kits. One suggestion was to go to Halcyon, whose legal actions put Salvo out of business and gave them much of their inventory. Halcyon, however, does not have any parts for old Salvo regulators.
So, there does not appear to be an option for me unless I just take it apart, clean things up, etc.