So, I kind of can't believe I banged my head against this until it worked:
1) QEMU x86 on RaspPi
2) FreeDOS on QEMU x86
3) MS Net Client 3.0 on FreeDOS
4) Host Samba drive mounted via MS Net Client 3.0
5) BBS Door game running from mounted Samba share
6) Linux build of Synchronet BBS running parallel DOS door game processes on Rasp Pi with shared files for multiplayer in Legend of the Red Dragon
Got to be a better way to do it, but this seems to be working-ish for now.