Alias file bluk update changing device IPv4 addresses to MAC IDs

[RobLatour]

In preparation for a move from an IPv4 only setup to an IPv4 & IPv6 setup, from what I read, it appears it would be a good idea to change all my device aliases from being Host (IPv4 based) to MAC Id based.

The majority of my firewall rules use Aliases, so I'm thinking if I do this and switch the scope of those rules from IPv4 to IPv4+IPv6 then all those rules will apply nicely to both IPv4 and IPv6.

So to get this done, I have downloaded:
- the Alias's json extract, and
- the DNSMASQ DNS & DHCP - Host extract .csv file.

My plan, unless there is already a script out there (hence in part the reason for this post) is to write a script that will create a file I can import (upload) into the Aliases list which contains for all devices aliases a replacement entry that uses:
- an Alias Type of 'mac' instead of 'host' and
- in content replaces the existing IPv4 address(es) with their matching hw_address (mac) from the DNSMASQ DNS & DHCP - Host extract .csv file.

So my questions are:
1. Will this work?
2. Is there already an existing script for this?