Issue two currencies. The regular currency stays the same but issue a minimum standard or basic income of needcoins when you spend money in a shop the money for needs is taken from your need budget. Anything that you don't particularly need such as coffee or luxury garments is taken from your other account.
This is how you issue basic income without affecting the economy. Everyone's receives a budget of what they need - this incorporates travel to work, food, shelter and bills. Anything that is strictly not needed such as luxury travel or snacks or luxury purchases comes out your regular money account.