I had a thought: if the remote code for Dish could be replaced with a Channel-Up, Channel-Down sequence, then I could enable the "send enter after channel number" option, and then it would send a channel up/down after sending the channel number.
Assuming my dish tuner's guide is set up appropriately so the Up/Down buttons work appropriately, this would guarantee that I don't get tuned to, and stuck on, an "unsubscribed channel".
What do you think? Can the IR blaster codes be changed so a single code actually sends 2 keys in sequence? If you have any ideas, I'd be willing to try them out.