Fakechroot instead of proot for unprivileged nix installs

Normally, for a nix installation without root access nor user namespaces, proot is recommended. However, this is slow (e.g. has no real multi threading AFAIK) and buggy (seccomp filtering not working, acl problems, …, in my case: seems like path substitution is stopping at some time for long-running processes, so fork to any program doesn’t work anymore).

Has anyone successfully tried to use fakechroot instead?
Or is fakechroot missing necessary features?

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