You might be doing too much work at the wrong level of abstraction. VMs should use host clock synchronization. It requires some work and coordination, but it eliminates the need for ntp in VMs entirely.
Hosts should then be synced using PTP or a proper NTP local stratum (just get a proper GNSS source for each DC if you have then funds).
Hosts should then be synced using PTP or a proper NTP local stratum (just get a proper GNSS source for each DC if you have then funds).
https://tsn.readthedocs.io/timesync.html
Deploy chrony to bare metal servers wherever possible.