Hah from reading your original post I already knew you were good. My comment was really meant for those interested in these setups (I get asked about this quite often) without realizing the time and effort needed to maintain it. This can be a real rabbit hole as I started with an Edgerouter and Unifi AP and eventually worked my way up.
I really like your idea of having a separate router that can be used standalone if the main system fails, and might actually consider adopting that for my family as it would be very useful if I'm not available. Currently I'm looking into a virtual HA Opnsense setup on two servers to maintain routing if one fails and cannot restart for whatever reason.
We take this router with us on trips. It is nice to have your own fast, mobile Internet with you (no transfer or bandwidth limits). And when it does not serve as backup Internet it has site-to-site VPN to our home network.
I really like your idea of having a separate router that can be used standalone if the main system fails, and might actually consider adopting that for my family as it would be very useful if I'm not available. Currently I'm looking into a virtual HA Opnsense setup on two servers to maintain routing if one fails and cannot restart for whatever reason.