Hello Taka,
Thanks for reaching out and I hope you are doing well.
AKS does not support Karpenter currently but this can change anytime, the best place to monitor updates is in the GitHub link you shared:
https://github.com/Azure/AKS/issues/2712
And also:
https://github.com/aws/karpenter/issues/963
Another suggestion is to submit a new idea in our Feature Request portal, so that can be reviewed by our team:
https://feedback.azure.com/d365community/forum/aabe212a-f724-ec11-b6e6-000d3a4f0da0
Please "Accept the answer" if the information helped you. This will help us and others in the community as well. Feel free to reply with any other questions or concerns.