This seems to be essentially fixed in initramfs-tools. The netconsole module is in the initramfs by default, although you do have to arrange for it to be loaded (I think that's OK since you have to configure netconsole anyway). To do that, put 'netconsole' on a line by itself in /etc/initramfs-tools/modules and run 'update-initramfs -u'. See mkinitramfs(8).
This seems to be essentially fixed in initramfs-tools. The netconsole module is in the initramfs by default, although you do have to arrange for it to be loaded (I think that's OK since you have to configure netconsole anyway). To do that, put 'netconsole' on a line by itself in /etc/initramfs- tools/modules and run 'update-initramfs -u'. See mkinitramfs(8).