I've recently been test driving SPR[1] which is a security-oriented distro for Wi-Fi routers. The team behind it are serious about Wi-Fi security and have a research lab[2] that has been credited with several CVEs in the likes of Apple's network stack. The headline feature is strong device isolation for semi-trusted guest and home automation devices, and the software stack is based around containerized and audited Go daemons.

It ran pretty well for me as a travel router I cobbled together from a Raspberry Pi and Netgear A7500 USB dongle for a stay in a short-term rental where the infrastructure network was shared with other units. More recently I have been trialing their CM5-based model with Wi-Fi 7 and 2.5GbE PoE for use as primary home Wi-Fi.

1: https://www.supernetworks.org 2: https://www.supernetworks.org/security-labs.html