After much work, Suzi is finally back in action again! 🥰 I've given it three oil flushes so far, and there isn't any noticeable sign of coolant contamination left in the oil, so I'll probably run it on the current oil for a little while, before giving it one final change with decent quality oil.
Also, don't hold your phone and drive, kids. Particularly if your car is a manual 🙃