Is it possible to use it in the MT transmission of a ZC33s Swift Sport with an additive amount of 5-10%? Also, is there any possibility that the transmission will be easier to start by adding the oil?

It is possible to add to the Swift Sport MT transmission, and the recommended amount is 10-20% of the total oil amount.
Initially, there is no significant change, but there is a high possibility of gradual improvement while driving.