I would like to query a BOOTP server as a specific MAC address to test the response. What tools exists for macOS? Something like this? https://www.weird-solutions.com/enterprise-solutions/bootp-turbo
You can spoof your MAC address, which is significantly less effort than setting up a VM.
Your command should be along the lines
sudo ifconfig en1 Wi-Fi xx:xx:xx:xx:xx:xx, where
en1 is your network interface and
xx:xx:xx:xx:xx:xx is the MAC address you'd like to spoof as.