Matter of fact, the funny part is it if you use Ether_II vs 802.(2|3) it is actually faster now.
I have NW6 and have successfully connected an OS/2 Kiosk to it, using the IPX OS/2 Client.
Since OS/2 also supports SMB, Netware 6.x+ also has SMB support, using (believe it or not) SAMBA on Netware. Netware now also supports NFS exports out of the box as well.
So you do have many choices to go forward with in any case.