I think that the only way to get the wounded chindit is buying the Chindit Box Set. They say this in the website description:
Command: Officer with Thompson SMG, Sergeant with M1 Carbine, Medic and radio operator. 2-man 2” mortar team.
· 10-man Section: 2x NCO with M1 carbine, 2-man Bren Gun team, 6 Chindits with Lee Enfield rifles.
· 2 Burmese scouts
· Mule and handler
· Random wounded Chindit
I hope that helps,
Regards.