Hi Meritez,
It is a V1 Orbi, however I don't think my technical skills are up to installing Openwrt.
The Cudy mesh router is very attractively priced. However, I need at least 3 1GB Ethernet ports on the main router, if i am to take the DGA0122 out of the solution. I'm very tempted to buy from Amazon due to the ease of returning kit if it doesn't work as planned. There are other Cudy models that have more ports, but not stocked by Amazon as far as I can see.
Thinking that the TP-Link XE75 or the Asus ZenPro XT8 might be possible options based on reviews that I have seen so far, but more than happy to consider other suggestions from you.