I am tinkering with something similar right now, with the elf-equivalents being virtually illegal outside the borders of their own empire.
So, here’s what I would suggest you consider:
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First, discuss it with your players and make sure you’re not going to piss any of them off by doing this. If any of them were planning on playing said race, make sure they’re okay with the impact on their play style.
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Consider the storytelling conflicts you want to explore with this. What encounters do you want to put your players through, and why? What themes are you looking to explore?
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Consider the larger impact on other parts of your world. Try to make this more than a point that exists in isolation and a vacuum.
Not that guy, but also a (not-software) engineer. Coding is really great for a few things:
Unfortunately I cannot actually write code to save my life, but it’d be real useful if I could!