Porting OpenWRT without UART or serial
So I have an ASUS RT-AC67P that I want to port OpenWRT to, but the router is essentially a plastic shell with no externally accessible serial/UART port. I can't find a non-destructive way to open this router and access the serial/UART console.
I only have 1 of these on hand, and I am not really willing to basically crack/dremel the case open or buy another one of these cheapo routers in the case it dies in the process of me cracking it open.
I understand that having access to a serial/UART console is important for this type of development/porting as a wrongly made firmware would probably break network connectivity and force me to use serial or UART in order to do recovery or flash a known good firmware.
Are there any particular good practices or tips and tricks I can follow in order to reduce my chances of having to use the serial connection?