Custom upstream DNS per interface

[ncompact]

I am only providing you with the reference document for having multiple instances of dnsmasq:

https://openwrt.org/docs/guide-user/base-system/dhcp_configuration#multiple_dhcpdns_serverforwarder_instances

from:

Can a VLAN be used for another instance of dnsmasq?

I have an idea of setting up another instance of dnsmasq. But clearly I need another interface/device. I have zero experience with VLANs. Can a VLAN be created and used specifically for setting up a second instance of dnsmasq? Can this be done without a VLAN? Possibly with just another interface on br-lan? This would be for wireless users. I want some Wi-Fi users to go to one instance of dnsmasq while others (via MAC address) be sent to the second instance of dnsmasq. I did this many years a…