Transit Bangladesh Passport

We are a couple and wife is German, husband Bangladeshi but with German residency/bangladesh passport.
On the way from Bali back to Germany and 18 hour layover (uhh) in CAN airport. I know german wife can get up to 72 hours If we want to go into town..will I be able to get 24 hour visa and go to town or will i have to stay in airport?
South china airline also gives us free hotel but i am not sure if i can leave the airport and go there.lol