Your process reminds me of how I used to write 6502 assembly in high school—I didn't have the money to buy one of the macro assemblers I would see advertised in

Your process reminds me of how I used to write 6502 assembly in high school—I didn't have the money to buy one of the macro assemblers I would see advertised in the Apple mags (let alone buy a computer of my own—I would stay after school to code in the computer lab), so I would write out my code on graph paper, and hand-assemble it (with a column to keep track of the memory address) and then type in the hex code in the monitor. I can remember thinking about an idea to write a relocatable 6502 program loader which would go through the code and rewrite addresses of memory references so that code could be loaded into whatever slot of memory was available for it to coexist with whatever Applesoft program was running next to it.