There are tons of terminal emulators that still support zmodem around, SecureCRT (commercial) supports it. Since last looking at them, seems they've got a Linux version now. Going to give it a try, I used to live in SecureCRT in Windows
There's a "zssh" project that wraps an SSH session with ZModem handling, but it would be neat to see a tool like that this didn't require sz and rz installed.
You can accomplish the with a new scp session on the client server, but it's an extra step. I use this as a helper when for building the scp command.
function scppath() { echo $USER@$(hostname).$(dnsdomainname):$(realpath $1) ]