If I wanted to enable users to upload their avatar to `example.my.worker.dev/:user-name/avatar.png`?

If I wanted to enable users to upload their avatar to example.my.worker.dev/:user-name/avatar.png?
Could I use a dispatch worker which calls a single script as the user worker, which makes an upload session request on behalf of the user. If not, where am I going wrong? If it is possible, would I be capped at 20k users?
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