@premier3092 Yeah, I'm doing something similar.
Currently I do my investments through niyomoney.
They give the option to either have an NACH, or do manual investments on the SIP days.
The manual investments can be either through UPI, or net banking, via their app or website.
I can even skip a month of I don't feel like investing(just ignore the payment reminders)
They also give the option to modify the SIPs easily.
n. b. Not an endorsement or anything ; just what I'm currently doing.