IPv6: Host Interface RA (Router Advertisement) Surpression Missing?

[gigabitguru]

I've run into what appears to be a missing command line configuration item, but wanted to see if there's a way to do this via proper TNSR CLI commands.

• GOAL: Disable any Host Interface RAs from being processed
  • This includes creating IPv6 Addresses and/or Routes
• ISSUE: RAs come in and apply IPv6 Addrs / Routes on host interfaces
  • no configuration options appear present in docs or the CLI to surpress RAs
• NON-PERSISTENT FULL WORKAROUND: applying accept_ra: false to the proper section of /etc/netplan/50-tnsr-host-interfaces.yaml temporarily works to suppress RAs
  • but as expected, any reboots or changes to Host Interface configuration in the TNSR CLI blow this away
• UNACCEPTABLE HACK WORKAROUND: set a more specific route for source client subnets to take a different route versus the default

How can RAs be suppressed in a supported, persistent way? In my situation, they conflict with routes required for SSH connectivity to manage these hosts.