I recently added dual screen support to the ELKS console-direct driver, so if your system has both MDA and CGA cards, you enable CONFIG_CONSOLE_DUAL in your kernel config and select runlevel 5 in /bootopts, it will allocate 4 ttys, with one of them on the MDA display. You can see this setup running on my hardware in this pic in the README:

https://raw.githubusercontent.com/ghaerr/elks/refs/heads/mas...

I could use some help testing it on EGA and VGA hardware, as I don’t have any 8 bit cards for those in my collection.