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Advanced filtering within subnet possible on MI424WR Rev. E?

My MI424WR Rev. E has its wifi turned on and to get good coverage throughout the old, 3-story house it is augmented by two additional wifi routers running dd-wrt as access points. Both family devices and guests might connect to any of the three wifi connections. Family devices have reserved IP addresses below while guests receive DHCP from onward.

I would like to block the .200-.254 "guest" portion of the subnet from accessing the .2-.100 portion of the subnet using advanced filtering. I am successful in adding a filtering rule to block the guest IP range from connecting to the WAN, however I am unable to make a similar rule to block LAN access. Is this possible on the Actiontec?

I realize I could connect the additional routers to a VLAN and create a separate subnet, however that would requre an additional 3 wifi access points to allow both family and guest access throughout the house.