No way to rate limit requests from Vercel without enterprise?!

I was planning on using Cloudflare rate limiting to protect my API, but since most of our requests come from a frontend hosted on Vercel, I was planning on using the x-forwarded-for header to increment buckets on real user IPs instead of Vercel's address.

It looks like request header filtering is an enterprise only feature, we're stuck on business.

Is there any workaround or do we need to roll this ourselves?
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