If your use case requires custom networking and a SLA, isn't that a situation to just go with one of the big clouds (AWS/GCP/Azure) or else rent a VM or colo at a local data center?
The consumer-facing CDNs usually cache HTTP traffic at edge nodes because there's a standard pattern for it. If you're doing something different, you can probably go to a lower level of networking and abstractions?
Hey, I work at HAProxy. Want to reach out to me in a DM on https://www.linkedin.com/in/jakubsuchyus/ and I'll see if I can connect you with our Edge team to see what we can do about your Asia -> NA needs?