Yes! Similar to remapping the Arrow-Keys above, you can remap - say the menu (fn+RightCtrl) key to SysRq.
Just add another line to /etc/udev/hwdb.d/90-nkey.hwdb with the following, including the leading whitespaces:
  KEYBOARD_KEY_<ScanCode>=sysrq        # force remap sysrq to Fn+RightCtrl
You can get the <ScanCode> by running
evtest /dev/input/by-id/usb-ASUSTeK_Computer_Inc._N-KEY_Device-*-kbd
and pressing the RightCtrl key.
In this case, it is 70065
Testing ... (interrupt to exit)
Event: time 1662839073.640933, type 4 (EV_MSC), code 4 (MSC_SCAN), value 70065 <--------- Substitute this as <ScanCode>
Event: time 1662839073.640933, type 1 (EV_KEY), code 127 (KEY_COMPOSE), value 1
Event: time 1662839073.640933, -------------- SYN_REPORT ------------
Then update hwdb with:
sudo systemd-hwdb update
sudo udevadm trigger