So an interface which reads in indices at [0,n-1] and then increments the values before calling the appropriate methods probably would have worked, but for personal reasons, I couldn't use this approach.
Things that helped me:
- Where I was using variables purposed for indexing, I could increase their initial value by 1.
- Large sections of relatively repetitive code (same operations, different cell ranges) into small loops where there were less values to manage.
- Helper methods for commonly used formats for were also very helpful in preventing me writing the same range multiple times.
Beyond that, however, I unfortunately didn't find a simpler way than to add [1,1] to everything.