Reviving a dead open source project: fixing PyKMIP for modern Veeam integration

When I started looking for a free, self-hosted KMIP server to use in my homelab, PyKMIP seemed like the obvious choice. It is the only open source Python implementation of the KMIP protocol, it has been around for years, and it has a reasonable amount of documentation. What could go wrong? As it turns out, quite a lot.