I think you are way overthinking this.
I suggest that you set up a relationship with the person at the Mexican Consulate closest to you before you make any real decisions.
We decided to get Permanent Residency before we bought a house here. It could have been an issue but wasn't.
In our case, I e mailed the Consulate (5 miles away) and asked all about Residency requirements. Oswaldo gave me the list and respectfully asked if we would consider sending him all of the paperwork electronically before we made our appointment. Of course! We made the changes he suggested, added and subtracted where he suggested, and when we made the actual appointment to come in, it was with him!!! Took us less than 30 minutes to have our paperwork approved. It took about the same amount of time when we arrived in our final destination in Mexico.
We had tried to anticipate everything, but when it came down to it, he worked with us, and made it easy. We had anticipated many more steps.
We both suggest that you contact your local Consulate and try to set up a relationship with them before you make any real decisions.