I work at a Mitsubishi dealer.
We do not install OEM remote starts, we use a third party which works with the factory fobs. We have install time down to about 45 minutes on the Mirages.
Now, I can't be certain, but there MUST be a reason we refuse to install factory remote starts (and that reason might only be cost).
I know you have to be very careful of which harness and which adaptors you use, and that's across all of our companies brands. Two identical parts with one digit difference in the PN that might very well be wired exactly the same... one will work, one won't. We stock 3 types of ilink remote starters, and about a billion and a half harnesses.
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View my fuel log 2018 Mirage ES 1.2 manual: 43.5 mpg (US) ... 18.5 km/L ... 5.4 L/100 km ... 52.2 mpg (Imp)