Command brcrpc can run clientrpc commands on an underlying server (for
example, a running brclient instance).
This requires a recent Go version.
$ go install github.com/companyzero/bisonrelay/clientrpc/cmd/brcrpc@latest
$ brcrpc -h
$ brcrpc -url wss://127.0.0.1:7676 VersionService.Version