Plan B may be buying Fummins a round trip plane ticket to Atlanta, & stock piling your refrigerator with beer!
Speaking for myself - If I were in your position, I would focus on paying off my Mirage asap first. Once it is paid off, I would start putting aside funds for things like a CVT replacement. If those funds aren't needed for that purpose, I would put them toward a future vehicle purchase.
I believe my small town mechanics would replace a bad CVT with a used one. I wouldn't expect them to rebuild a transmission (automatic or CVT), however. If the used transmission they install has issues, that would be on me not them.
Have you contacted these guys?
Given how many miles you drive per year, what year would it be if your Mirage's CVT went out @
If I was that anxious about something, I would remove it from my life. If that was taken the wrong way, I apologize. I was only speaking for myself. I own a lot of old stuff. I expect it to break down sometimes.
What will give you peace? If buying/storing a used CVT is the answer, I hope you find one soon!
P.S. - Many of us have more than one job. I teach middle school science, coach basketball (girls & boys seasons), & do btw driving lessons on Saturdays (& during the summer months). Plus, I cut/burn some firewood, love to hunt, & do lots of other stuff.
But to clear up one post, there are 2 kinds of junk yards. Full service(they pull parts) and pick and pull type/pick your part etc...(where you walk around and pull your own). There's even some that have 2 sections, pick your junk and full service. Depending on the yard you can sometimes dicker the price down. Large chain places like lkq who typically have fixed prices are far less likely to budge on prices though.
You can search on car-part.com for a cvt(transmission) or just google wrecking yards and call around like people used to do. Around here many full service wrecking/junk yards have a mechanic and shop capable of doing most installs.
So you might be able to find a decent wrecker who does installs, have them to source you a cvt(if they don't have one) and install it for you. They might be willing to take a gamble on a late 14+ cvt and see if it will work for you? If not they should be able to find one with the proper production date(if they care to even bother looking into what fits).
The other options are find a relatively competent shop and see if they'll source one and install it for you. Installing a cvt is no different than a regular automatic transmission.
When I was at a wrecker most parts were sold to dealerships and shops, or other wreckers as most were linked together and could see each others inventory
I know you are worried about the longevity of your CVT but instead of planning for its ultimate demise, what I would suggest is that you focus on extending its life as long as possible. Learn how to do a fluid change and start making it a routine maintenance item. The fluid doesn't seem too expensive... you could do it every 20k if you wanted and surely add some peace to your life. I do agree with Eggman that you worry way too much about it.
View my fuel log 2014 Mirage ES 1.2 manual: 44.4 mpg (US) ... 18.9 km/L ... 5.3 L/100 km ... 53.3 mpg (Imp)