Support for shared-network

Under recent versions of dnsmasq (since at least 2018), you can specify the option --shared-network to support networks that overlay two IP subnets on the same LAN. ISC-DHCP-SERVER also offers something similar, but I do not see the same support in dnsmasq OpenWRT.

Unfortunately, a VLAN is not an option as machines on both networks share cabling through several switches that do not support assigning a VLAN per port. Also, I do no know how VLANs would work for WiFi connections where devices on both networks share the same access point.

I am likely overlooking an obvious solution, what am I missing something?
There must be an alternative way to support shared-network? Specifically, to support DHCP to both address spaces utilizing reservations, and each segment would require it's own broadcast address.

For example, an OpenWRT router has a LAN address of 10.10.X.1/24, and we have a second address space on the shared network with the address space 10.10.Y.0/24. Broadcast IP address for 10.10.X.0/24 should be 10.10.X.255, and broadcast IP address for 10.10.Y.0/24 should be 10.10.Y.255.

10.0.X.0/24 leases would have the following options:
list dhcp_option '1,255.255.255.0'
list dhcp_option '3,10.10.X.1'
list dhcp_option '6,10.10,X.2,8.8.8.8,8.8.4.4'
list dhcp_option '15,domain1.local'
list dhcp_option '28,10.10.X.255'
list dhcp_option '119,domain1.local,domain2.local'
list dhcp_option '6,10.10.X.1'

10.0.Y.0/24 leases would have the following options:
list dhcp_option '1,255.255.255.0'
list dhcp_option '3,10.10.Y.1'
list dhcp_option '6,10.10,Y.2,10.10.X.2'
list dhcp_option '15,domain2.local'
list dhcp_option '28,10.10.Y.255'
list dhcp_option '119,domain2.local,domain1.local'
list dhcp_option '6,10.10.Y.1'

Edit 1: wyldphyr3 suggestion does not appear to work in my situation, nor does it seem to have been included in the current branch of OpenWRT.

Any help would be appreciated!

M