Yeah you can use Cloudflare to serve amp from your own subdomain instead of Google's CDN. https://blog.cloudflare.com/accelerated-mobile/
"Cloudflare now powers the only compliant non-Google AMP cache with all the same performance and security benefits as Google."
https://blog.cloudflare.com/accelerated-mobile/
The term "compliant" would make it seems as though Google has them as a trusted source now and as such will show that content in AMP features in Google