Wow, that script looks amazing @Nash!
Not as cool as that one, but I have a script that assists in migrating from other firewall platforms to Meraki. You need to create all your objects and groups in a Excel/CSV file, and the rules in another text file. Then it can import them all.
https://www.ifm.net.nz/cookbooks/mfw.html
Also check out the new Meraki Firewall Objects beta. It makes things so much easier for these cases (not easy, just easier).
https://community.meraki.com/t5/Security-SD-WAN/Firewall-Objects/td-p/63980