Hardwax oil like rubio, osmo or odies seem to be the favourites when it comes to higher end stuff, you can apply maintenance coats and/or repair fairly easily from what I heard.
Whatever you do, you should do the same with the handrail, it’ll clash of they don’t match
Plants are also living creatures, aren’t you just drawing the line a bit further, and acting like its the only true way?
Why is it ok to harvest, kill, eat plants and not animals?