If one was able to alter a non-porcine treif animal to make it chew its cud and have split hooves, would that animal be kosher?
This question If a pig was genetically modified to chew its cud, would it be kosher? already discusses pigs and the answers mention that a pig would still be treif, though they don’t agree if other animals would be included in this halacha or not (see @Shalom’s answer which seems to imply that all animals would still be treif vs. @menachem and @ephraim’s answers which seem to imply that the Halacha is only by pigs) Based on that, would there be a difference in other cases, for example:
Would there be a different Halacha by birds or fish? Why?
Would there be a difference for what was specifically written in the Torah as treif (like pigs) and what wasn’t (like lions)?
Would there be a difference between beheimos and chayos?