Unable to use the same custom domain on two services

[cade-coreschedule]

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Tell us about your request
What do you want us to build?

Here's our challenge: we have a production App Runner service that has the Custom Domain *.example.com. This uses the "build from code" build process. We need to change this to "build from ECR". We can't update the service in-place, so we have to create a new App Runner service. We can build the new service, but we can't add the domain name *.example.com to this new one.

How do we migrate from service A to service B with zero downtime? We were intending to get it set up and ready to receive requests, then simply re-route the DNS. This seems impossible without deleting service A - incurring downtime - then quickly adding the domain name to service B and praying ACM validates it quickly.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

No alternative available for reusing the same domain name when creating a new App Runner service.

Additional context
Anything else we should know?

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[neidiom]

Try using CloudFront. I have a setup where the origin is AppRunner.