NStream P2MP Full Duplex

I want to setup a point 2 multipoint full duplex link

I am trying to achive 20mbit up / 20mbit down per 90deg sector

i was thinking of using NStream Dual but i want P2MP so i have to use nstream single

CPE end will also be a full duplex setup with maybe 20 to 30 CPE’s per sector so it’s like 40mbit agregate shared between 20 - 30 cpe’s

is it possible to use 2X RB52 and route the traffic to TX on 1 card and RX on the other with routing or mangle to have an outgoing packet via WLAN1 and the reply to it via WLAN2 ?