I would say a No to KWID AMT for the below factors :
1. No manual shifter / selector to control the gear shifts, instead a pathetic knob.
2. No Sports / L / 1/2/D3 mode in the transmission
3. No creep function
4. Kwid AMT badly vibrates at city slow speeds
5. Overtaking would require lot of planning in advance and also extra ordinary throttle tapping skills to be safe.
6. Downhill drive would be tedious.
Rather I would recommend Celerio AMT with your feasible variant. Tata Tiago AMT too is nowhere bad, rather you get a bigger engine (1.2 L - 3 cyl).
Tata Nano AMT is the best one I would say, in terms of simplicity, maintanence, city handling. When you want to use the car hardly 100 km a month, why would you plonk your hard earned Vitamin M into a tin box with wheels. If I were you, I would rather hire an OLA / UBER and pay the fares rather investing in a car of my own, maintaining, risk bearing, insurance, etc, which are hassles.
I own a Santro GP Plus 2013 and have driven only 30,000 kms till date in 5 years, which approxes to 6k km/month, which is not a bad usage for petrol car.
My wife too prefers an Automatic, preferably an AMT, but I have developed too much love for my Santro in these years of ownership and unable to part with it, at the same time, can't afford one more car keeping my Santro with me, which wouldn't make a sense for me.
If I were in your place, I would silently pickup Celerio for the below pointers:
> Wide network of services
> Good after sales experience
> Mileage avataar (around 17-18 kmpl in City and around 21 or even + in highways with AC in Drive Mode)
> Less expensive spare parts and maintanence.
> Japanese Suzuki K10 engine, with Magnetti Marelli transmission box.
Tata Tiago would also be in my list, as it is loaded with features and a non ABS
version with AMT, I guess comes on road for around 4.65L OTR - Chennai.