Hunter Pet Storage

Hi, wow noob here, playing a hunter. I’m currently in beast mastery spec but am considering trying Marksmanship at some point; however, I don’t wanna lose the set of exotic pets I’ve tamed thus far. Is it at all possible to backport the extra pet storage of later expansions into LK, like it’s been done with transmog?

It would be possible but it's a too custom change to be implemented since it's directly changing a class, even if it is QoL change.