Your Alto has an F6A single cam engine if i remember correctly, i dont believe there is an N2 ECU for this engine.
If you feel adventurous and have a spare ECU, i can offer to rip it's guts out and replace them with a programmable board for you.
I'm currently in the process of doing so for my alto. I would only charge you the cost of the components to put it together.
However it will need mapping on a dyno by a tuner as it will be supplied blank.
A quick image of what i'm talking about attached below.