For what it's worth, this is almost how the Wasabi coinjoin coordination service works, so this model is proven with 7+ years of deployment.
It's magical tech, use it!
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I vaguely recall reading something along the lines of Apple using (or maybe just proposing) tech like this for their VPN-like private browsing product.
Google uses RSA blind signatures it for their VPN to achieve exactly this, to decouple of the VPN use from the user account.