It's a great discovery on your part that this system works for 2014-15 Mirages.
You probably won't find me paying a Mitsubishi dealership to program codes in my Mirage. That's based on principal more than anything else. When large tire chain stores struggle to program a Mirage with all their expensive equipment, I feel that is a poor reflection on Mitsubishi (not the tire shops).
If the Mirage's TPMS did something special, I may cut them some slack. Their system, however, does absolutely nothing special. You're sharing information on a device that costs less than $90, & it offers more than what's standard on the Mirage. I understand why TPMS exist. I owned a 1999 Ford Explorer that got recalled for its Firestone tires. Under inflated tires were exploding, & people were dying. Ford & Firestone were both guilty on that one.
All cars should have a system like you are sharing. It should be simple to reset codes, & it should be able to give more than one of your 4 tires may be a little low on psi. This proves the technology is not all that expensive to do that. A person should be able to put 4 wheels with sensors on their car, hit reset/register button, & be all set to go. A person shouldn't to do anything else, & I feel all cars should be this way. It's a safety feature. Safety features shouldn't be a mystery to figure out. I am still venting! Sorry!
What you have shared is a great find! Likewise, your early thread on cloning sensors was excellent. It does give people options to consider, especially if you need service done on sensors anyways. I appreciate your effort to explore all this and share it. What's your next project?