Many lovely doors available on ebay at reasonable prices.
Currently £4.99! Would need some cleaning up – but would let lovely light into the hallway with all those glass panes.
It’s quite tricky to replace a door. I watched a helpful YouTube video, and was pretty confident until he said ‘adjust your circular saw blade so as to only cut through the frame’. You what? I think this is a ‘pay-someone-experienced-to-take-care-of-it’ situation.