generally I use ipmi SoL for remote access during kernel debugging, but laptops don't have a BMC... so there are a few options inline with netconsole (inc a porting commit of netconsole itself)
https://man.freebsd.org/cgi/man.cgi?query=dconschat
https://docs.freebsd.org/en/books/developers-handbook/kerneldebug/
https://reviews.freebsd.org/D13064
for those pondering about linux netconsole, see:
https://www.kernel.org/doc/Documentation/networking/netconsole.txt