I was able to get the Epson APL to work, why not try a Grappler Plus Parallel Interface rom that's 4K.
After not getting the bank switching right, I finally got it!
And now I can do rotated graphics with CTRL+I G R <CR>. Yay!
With the Grappler Plus, you can use an asterisk to set the Epson graphics mode from 1 to 6 so you can do 80/72/90 dpi as well as 60/120/240.
CTRL+I G * 4 <CR> will do 80 dpi.