Interesting. But just because gnomes came to prominence because of their engineering ability doesn’t mean every gnomes specializes or cares about engineering. To do that would be to brush every gnome who doesn’t do engineering under the rug, and that’s not right.
Panda having tiger palm would be okay, it’s one of the weakest fillers and would give a resource completely useless to every class besides monk. Touch of Death would be ridiculously op on tanks, so I’m afraid that couldn’t happen.
The undead I can see thematically obviously, but in game would be ridiculously op in pvp, and any content going forward would be unable to use poison of any type just because of undead, or would require people to roll undead for specific raids, and that would be detrimental to gameplay. No one wants to be forced to be a certain race just progress.
I’m hoping you were joking, but it was a fun thought exercise.