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Handful of goofy ideas:
Could you make an adapter tray? By that I mean a small tray that on the bottom fits securely in the stock tray and bolts/Lock into the stock tray, and on the top of the adapter has provisions to securely hold the battery you want to use.
Have you considered adding a super capacitor booster box? Some folks have replaced their car batteries with smaller super capacitor banks and have demonstrated that they hold starting charge for many days, work in winter, and can sustain some accessories for some time with engine off... I'm not sure I'd trust one for replacing the battery in normal use especially in Canada and under your circumstances....But what if it was used only as a starting reserve(along side a regular battery)? You could add a high current diode in series with one of the leads to the cap bank to make it such that the car can charge but NOT discharge the cap bank. You could then add a high current starter relay in parallel with the diode... you could wire that relay to the start position of the ignition (to give you a jump every start) or to some emergency jump switch.... I've actually considered this for my car.
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