I'm hosting RouterOS CHR 7.11 with VMware ESXi 6.7u3 free license and making great progress learning Containers and ROSE-Storage.
Does RouterOS CHR with extra Wifiwave2 package have enough there to test Wifiwave2 configurations without radio hardware?
In particular learning Wifiwave2 device configuration first then follow up wth Wifiwave2 CapsMAN later.

No, RouterOS CHR with the extra Wifiwave2 package does not have enough functionality to test Wifiwave2 configurations without actual radio hardware. You would need physical or virtualized radio hardware to fully test and configure Wifiwave2 features in RouterOS CHR.

virtualized radio hardware

Thank you! Can you elaborate on how the above might be done?

hAP ax3 is my core router. Is hAP ax2 a suitable configuration testing proxy for ax3?

You always need 1 physical radio.

AX3 or AX2 have physical radio.
Any device working as capsman has virtualized radio but that implies there is a cap connected to that capsman controller, so still there would have to be a physical radio.

hAP ax2 is sufficient for training purposes.