Oh man, I just came across these threads. I think I'd seen the title of the Tallin one, but dates didn't work, so didn't look into it at all. Looked further for Marrakesh and I now I'm positively green with envy!!! This feels like something that would be way more achievable for me than the Mongol Rally.
Will definitely keep an eye out for 2026 announcements, so I can avoid booking pesky things like work.