Regardless of which alternative you take I suggest that you first help the community by collecting all details and debug information and logs asked for in the Device support request template yourself and post that there to try to open up a dialogue with quirk developers there → [Device Support Request] Hue Ambiance Gradient Lightstrip · Issue #2488 · zigpy/zha-device-handlers · GitHub
Could be that users actually owning such a device just need to provide much more detailed information. Anyway, it usually help the ZHA developers to get more information and that in turn can maybe help someone else even if you decide to move to a different Zigbee gateway application/solution.
I suggest that you also buy another Zigbee Coordinator USB adapter and install Zigbee2MQTT in parallel (as you need a dedicated Zigbee Coordinator adapter for each Zigbee gateway host application solution), that way you can continue to test the ZHA integration and use both it and Zigbee2MQTT at the same time (with the limitation that any Zigbee device can only be joined/paired to one of them) → Home Assistant addon | Zigbee2MQTT
For Zigbee2MQTT I recommend buying ITead’s “Sonoff Zigbee 3.0 USB Dongle Plus” (model “ZBDongle-P” based on Texas Instruments CC2652P) → ITead's "Sonoff Zigbee 3.0 USB Dongle Plus" (model "ZBDongle-P") based on Texas Instruments CC2652P +20dBm radio SoC/MCU
That or any other CC2652P-based adapter are relatively inexpensive and those work great with Zigbee2MQTT as long as you try follow all these best practices and tips for each Zigbee Coordinator and each Zigbee network → Zigbee networks: how to guide for avoiding interference and optimize for getting better range + coverage …which also include upgrading the firmware → https://github.com/Koenkk/Z-Stack-firmware/tree/master/coordinator
You could alternativly buy a Philips Hue Bridge and connect that to Home Assistant via the Hue integration but I do not recommend buying that if you do not already own one → Philips Hue - Home Assistant