Would running a Docker container be an option for you?
The thread suggests that might not go entirely without a hitch (file permissions are a pain), but maybe with support from someone who has successfully run a monitor off that container, it is doable.
E.g., I think it would be useful to mount a directory from the host in the container, or otherwise ensure the credentials generated during registration survive destruction of the container, e.g., when upgrading the container, or switching to the native implementation once it is accessible again.
Maybe relevant to note: Running a monitor is currently reserved for accounts with a least one server verified at least 18 months ago. This is because of the prominent and somewhat critical role the monitors play in the system. It allows a prospective monitor host to gain a certain level of experience running a stable NTP service before running a monitor.