It wouldn't be impossible, but it would require such a huge rewrite that I would need to start from scratch. I was considering a version that uses the ECS keyboard for code entry.
In my earlier post, I laid out the use of all 256 GRAM cards that the Tutorvision has available. By itself, the packed digits requires 126 cards (that's including the negative numbers), nearly twice as much as the Intellivision has available. That means I would have to double the width of the "simulation" room and have it scroll, making only some of the mailboxes viewable at a time. That could just about defeat the purpose.
What I could do is reverse the order of the objects, having the Output tape at the far left, followed by the "state", and then the Mailboxes to the right. That would work for the smaller example programs in the instruction manual, if I keep the mailboxes displayed in "XY" order.
For the immediate time being though, my focus is to have a "September 2021 release" ready within the next two weeks. I will have another Addendum with intermediate exercises, and probably one simple bugfix.