I had more success digging into MAME ROMs. There may be something that'll help you.
If not, someone should dump the chargen ROM of one of those. It's too bad the Computer History Museum has a strict policy of not messing with the articles.
Whilst I were 370 system admin (db2 and mac/Xia plus vse) I did my Sir/dbms on sperry 1100 earlier. The ibm green terminal in those era display Music is no comparison. And much better than the Pdp-11 Watfor ... all better than icl.
But when really do ibm those 3270 sna with ispf is still quite a difference especially the keyboard.
after a maze of twisty passages, all alike:
voila!for comparison, my normal setup is:
I would like to see other good setups