Having worked in a money environment,I can confirm the coin problem is real but sweets cannot be the solution.
I would recommend they have an assortment of items where one can pick something equivalent to the change or have a card to accumulate the coins or have a pricing that does not yield coins in change.
As for Wazuans you can Lipa na Mpesa or a card.
Msijipandishe pressure bure.
Love is beautiful and so are those who share it.With Love, Marriage is an amazing event in ones life time, the foundation of joy, happiness and success.