@cat.tails I suggest you edit your forum profile temporarily to show you at the location where your train ticket will take you. Your original post here shows when you planned to arrive there. Maybe there’s someone on the forum who could assist you in some way, either by taking an unplanned vacation or just have information that could help.
I also suggest you temporarily change your TrustedHousesitters profile to the same destination. Then if someone is looking for a local sitter they may contact you. It’s a long shot, I realize, but it’s not time consuming and it may just work.
I do think you are being overly kind to owners who are disrespecting you. I would not feel comfortable doing that sit at this stage, after what you’ve been through with them. There isn’t any excuse at this point that would satisfy me.