Kilning replicates the natural conditions which occur a few times throughout the year. So essentially if I hung or even left my burley in a jar for a year or two I’d assume that it would be comparable to leaf which has been “finished” in a kiln.
That said, even after a kiln run leaf can benefit from further resting.
The temperature in your garage sounds ideal for curing and ageing leaf, the only issue would be humidity. I’m not sure what that is like where you are. When I hang my leaf to cure, the humidity needs to be averaged over a 3 day cycle of around 60-75rh (I think, sorry brain isn’t working this morning). Any higher and the leaf will mould. Any lower and the curing process won’t occur. The reason the temperature of the kiln is roughly 120-130f is to prevent mould growing on the leaf which is sweating in high humidity