How is the software support? It seems like you could alternatively get a nice quad-core x86 Intel box with a handful of 2.5G ports off of AliExpress for around $120(you’d have to bring your own RAM and SSD in those cases though) and enjoy full Ubuntu/OpenWrt support.
Banana Pi BPI-M7 router board now available for $165 (RK3588 processor, dual 2.5 Gb Ethernet, WiFi 6 and BT 5.2) ( liliputing.com )
Does this look like a decent starting point for a first router build?...