After trying a few threads out on masks myself:
Crepe - the brand I got was pretty good, but it just didn’t quite curl and twist quite right. Maybe due to the manufacturing process.
Camel, young and old - too frizzy and doesn’t style well. Take a look at a stock TOTS Kirk and tell me that’s Hero hair. Nope.
Yak Belly - far too fragile and fine.
Mohair - not sure about adult mohair, but definitely not kid mohair. Also too fine.
I’ve rehaired my TOTS masks with Devon wool (which is close to Crepe in length/thickness) dyed by hand and it’s not a bad result considering I’m no pro.
Not sure how you’d get the sheen of a new Kirk though. Maybe a lot of shampoo and conditioner.