airport -z no longer functions in 14.4

TL;DR What's the replacement via CLI, programmatically, &| reliable AppleScript-fu.

Scenario

Auto-switching between Ethernet adapters (i.e., built-in MAC official/unofficial Ethernet adapters, third-party 10 GbE USB-C), and Wi-Fi.

Problem

Standard operation in post-Network Location macOS leads to assigning multiple IP addresses, causing havoc with applications and network services. Disabling Wi-Fi manually is non-starter.

Goal

Disassociate from Wi-Fi programmatically or from the CLI without powering off Wi-Fi to retain Wi-Fi PAN services such as AirDrop and AirPlay.

(Previous) Solution

Calls airport -z when needed to disassociate. Re-associate with other magic tools when Ethernet becomes unreachable. It worked reliably for over a year.

Invocation

sudo /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -z

Expected (previous) behavior

Wi-Fi disassociates but remains powered on

Actual behavior

1. Output

WARNING: The airport command line tool is deprecated and will be removed in a future release.

For diagnosing Wi-Fi related issues, use the Wireless Diagnostics app or wdutil command line tool.

1. (nothing happens)

Platform

14.4 (23E214) m1/arm64