Replying to myself after further investigation. On Wed, 17 Oct 2012, Steve Nickolas wrote:
3. Below the entry point ($1100, from BOLO.B1), a jump to an init function which copies $2000-3FFF up to a higher spot in memory (provided such is free, I don't know what memory the game itself utilizes), then blanks the text window and runs a new function (see below).
OK, no, there's no lower memory to hold the screen. It would have to go up on the language card. But the program uses only 1100-1FFF+4000-7FFF upon load so such a patch MAY yet be feasible.
-uso.