Multi-arch Docker image deployment using CDK Pipelines

I'd like to build a multi-architecture Docker image, push it to the default CDK ECR repo, and then push it to different deployment stages (stacks in separate accounts) using CDK Pipelines. I create the image using something like the following:

IMAGE_TAG=${AWS_ACCOUNT}.dkr.ecr.${REGION}.amazonaws.com/cdk-hnb659fds-container-assets-${AWS_ACCOUNT}-${REGION}:myTag
docker buildx build --progress=plain \
	--platform linux/amd64,linux/arm64 --push \
	--tag ${IMAGE_TAG} \
	myDir/

This results in three things pushed to ECR, two images and an image index (manifest). I'm then attempting to use the cdk-ecr-deployment to copy the image to a specific stack, for example:

cdk_ecr_deployment.ECRDeployment(
    self,
    "MultiArchImage",
    src=cdk_ecr_deployment.DockerImageName(f"{cdk_registry}:myTag"),
    dest=cdk_ecr_deployment.DockerImageName(f"{stack_registry}:myTag"),
)

However, this ends up copying only the image corresponding to the platform running the CDK deployment instead of the 2 images plus manifest. There's a feature request open on cdk-ecr-deployment to support multi-arch images.

I'm hoping someone might be able to suggest a modification to the above or some alternative that achieves the same goal, which is to deploy the image to multiple environments using CDK Pipelines. I also tried building the images + manifest into a tarball locally and then using the aws_ecr_assets.TarballImageAsset construct, but I encountered this open issue when attempting the deployment locally. I'm not sure if the TarballImageAsset supports a multi-arch image, as it seems like the DockerImageAsset doesn't. Any ideas?