You can also go the "App" route and make the whole thing an application that runs straight from flash.

Advantages are you can use many flash pages so your application can be massive, and your program will be easier to launch/distribute. We have the App signing keys so these days this route is pretty simple.

On the other hand you have to "allocate" ram to write to or scrounge for ram in predetermined areas in the address space. With regular assembly programs you can have "static" allocations that you can write to. Also programs don't take up a minimum of a single page, so they are generally preferred by people who are more comfortable with their calculator.

Damn, now I really want to revisit that z80 scheme implementation I was working on a few years ago...