OK... final grasp at a straw - your set of chairs for when they are not visiting, and when extended family come over, bring out fold out chairs with washable slipcovers? I know how difficult it is when you want to have a room that you like but you are having to adapt it for just for the one-off occasions and not as you would like it ideally. Perhaps that might work so you get what you want (most of the time!)

I doubt you're going to find that EXACT bench ... the website says they are custom made to order in Australia. For something 'similar', I would google image search 'tufted modern ottoman chrome"

Before replacing your curtains as this can be quite expensive for such a large window, if they are in good condition, add a band of extra fabric to the bottom in what ever suits you, your existing curtain track can then be moved up to the ceiling for good looking full length curtains without the large round eyelets, could save you a lot of money, I would look at replacing/removing the sheers cheers

I’m set up in our sunny spare bedroom. Happy with my spot as I have views to the street and a desk to work from.