You could add the front disc brakes. There isn't a kit so it would be a matter of just adding up all the individual components (not as hard as that just sounded now that I reread.) Look at the parts book.
https://evtechnicalservices.com/onli...uv-smt-sm2-sm4
Would need the hubs (4 or 5 bolt to match the rears) which are actual one piece hub/rotor assemblies, calipers, brake lines, steering spindles(with the caliper mounts).