But "where" is your mac? I.e., `cat clipboard | ssh ??? pbcopy`. I travel, so I don't always have the same IP address, and it's still too common to end up in a NAT'd hellscape with no usable IP. (Every office I've ever worked in, with one exception, has have v4-only NAT'd networks. Usually on a -PSK Wifi. Corp network infra is typically a joke.)
One could perhaps set something up to forward a connection to a local daemon and then use that forwarded connection to push data backwards, but the complexity is going up, and fast.