I know autos aren't supposed to be re-potted,...

Hi bro! You won't create any stress if you do it properly : the idea when repotting an auto, is to avoid touching any roots, and instead take the hole thing into its new container. I do it systematically with my autos : they're born in a 0.5L airpot, then once the roots are showing by the bottom of the container, I transfer them into 11L airpot. These airpots make it easy to 're-pot' because you can remove the container without touching roots. I won't try such an operation with a regular container unless you can "cut" the pot and proceed to gentle manipulations... I'll be around, good luck with these babies!