[ggdG]

You're ignoring the elephant in the room: frozen mammoth dung.

To restore the gut health of humans, there is this thing called "fecal transplant" [1]: use another person's poo to bootstrap the growth of your own gut microbiome.

There is an abundance of mammoth dung in the northern permafrost. When thawed, its microbiome becomes active again, producing methane. [2]

So resurrecting the woolly mammoth as a species is the hardest part. Equipping the first individuals with a proper gut biome will be really easy.

[1] https://en.wikipedia.org/wiki/Fecal_microbiota_transplant

[2] https://www.smithsonianmag.com/science-nature/melting-permaf...