Hi all,
Maybe there's already a standard mapping somewhere but I wanted one that matched what I've been using from X that worked similarly in virtual console terminals; so I made one tonight.
APL key is CAPSLOCK (eg CAPS+e = ∊), or right-ALT key to lock into APL mode.
Key mappings are for GNU APL with a US keyboard.
Load via 'loadkeys' from the Linux console.
Now, just to get a good APL console font that's larger so I don't have to squint so much :)