Solution for controlling a single DALI light

It will work with OpenHAB’s Zigbee Binding but support for Silicon Labs EZSP is experimental in Z2M:

https://www.zigbee2mqtt.io/guide/adapters/

Still, as OpenHAB’s Zigbee Binding does not yet support TI Z-Stack 3 used in Texas Instruments CC2652/CC1352 chip there is no other adapter that is a better option either for that matter. See:

https://community.openhab.org/t/discussion-about-texas-instruments-z-stack-3-0-and-cc2652-and-cc1352-zigbee-coordinator-adapters-with-openhab-zigbee-binding/129385

and

https://github.com/Koenkk/zigbee-herdsman/issues/319

Does Zigbee 3.0 DALI CONV LI not just present itself as standard Zigbee device using Zigbee protocol?

As I understand those are standard Zigbee 3.0 devices so it should really work with all Zigbee solutions.

https://media.osram.info/media/img/osram-dam-13970815//Zigbee_Folder_EN_310120.pdf

It should as they are at least list lited as tested/supported with Zigbee2MQTT should work with them all:

https://www.zigbee2mqtt.io/supported-devices/#s=dali