I wonder if you could change boot-args to display panic on the screen and wait to reboot; If you set:
nvram boot-args="keepsyms=1 debug=0x146"
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Enables kernel debugging features that will show you extra information. E.g.
0x01 - Stop at boot time and wait for the debugger to attach
0x02 - Send kernel debugging output to the console
0x04 - Drop into debugger on a nonmaskable interrupt
0x08 - Send kernel debugging information to a serial port
0x10 - Make ddb the default debugger
0x20 - Output diagnostics information to the system log
0x40 - Allow the debugger to ARP and route
0x80 - Support old versions of gdb on newer systems
0x100 - Disable the graphical panic dialog screen