If Bitcoin was legalized in Bangladesh, I would take a payment system through Bitcoin with a pizza restaurant. But my dreams will remain dreams because Bitcoin will never be legalized by the government in my country.
You dream to have a pizza restaurant, right?
Why don't you begin to build the restaurant with common payment system first?
Make your pizza restaurant be popular, then you can easily apply any system there.
Sure, your government won't legalize Bitcoin shortly, it must take time. But it doesn't mean impossible, there should be a chance. If more countries legalize Bitcoin as El Salvador does, I'm sure Bangladesh government may consider to legalize it. Moreover, if some countries can succeed to grow their economy by adopting Bitcoin.
Now, your focus is to build and develop your pizza restaurant. So, when Bitcoin is legal in your country, you can easily apply Bitcoin on the payment system.