Directly elected President and non-parliamentarians ministers?

I know there are cons of every systems. But Since parliamentary system is a total failure in Nepal. Can we all have a peaceful revolution for a week coming in streets to create pressure for amendment in constitution for "Directly elected Presidential system with non-parliamentarians ministers "?

Where people will choose their president

President will choose ministers from experts

Parliamentarians will be the law makers

The existing system is a total failure here. A person with zeal will never rise here for change.

Can we?