Mis interpretation I guess. I thought you meant in the URL.
For Cloudflare, set it up using guide #1, than use guide #2 to setup the catch-all.
Guide #1:
Guide #2:
https://support.cloudflare.com/hc/en-us/articles/200172286-Configuring-URL-forwarding-or-redirects-with-Cloudflare-Page-Rules
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