Removing CH340g chip from Arduino Nano clone.. any issues?
No problem whatsoever as long as you aren't powering the board over USB. You may still be able to do that though depending on what role the CH has in managing the power.

Personally I think all CH chip should be removed from all boards. They are horrible chips and cause no end of problems.

I assume you have an FT232 adapter board (or similar) to then use for the programming of your Arduino.