Sounds like a use case for CF for SaaS https://developers.cloudflare.com/cloudflare-for-platforms/cl

Sounds like a use case for CF for SaaS https://developers.cloudflare.com/cloudflare-for-platforms/cloudflare-for-saas/, special setup for Workers: https://developers.cloudflare.com/cloudflare-for-platforms/cloudflare-for-saas/start/advanced-settings/worker-as-origin/
It's what Pages/R2 use internally for Custom Domains
You'd have to take over the entire hostname/subdomain though, ex: example.client.com, can't just route specific paths. You could of course 404 on all but /endpoint
Learn how to use a Worker as the fallback origin for your SaaS zone.
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