What did you end up choosing Sanyukta? Would be interested in seeing what you chose to go with the greeny-white.

I would definitely try to move the handrail to the outside of the stairs, the wider the stairs appear, the more welcoming and functional they will be. I don't think I'd go with steel though, I would keep to the era which was timber, it could be painted or stained. I also like most of the ideas and in addition think that painting the rafters a light colour toning with your overall theme will make the whole area feel more expansive. Add a feature to the entrance by way of colour on the door, as suggested or some very sleek ornament on the wall as suggested or my preference would be to feature the risers as mentioned.

some photos would explain the dilemma

Maybe one of these dulux colours. With the correct combination of furniture and accessories will look bright and inviting.