Vindfald at Tivoli Friheden is 1.2m, so a Euro Fighter definitely fits the bill. Would also make sense working with Gerstlauer again on a ride that so closely intertwines with Cobra. The newer Infinity Coasters (Fury, Mystic, Pitts Special) seem to be 1.3m, so I can definitely imagine a Euro Fighter more. I think it has a left-turn into the station (rather than a right-turn out of it), and so the bit that points south-west (?) and goes under Cobra is the beginning of the ride. So, the first element is that complex arrangement of footers, whatever it is. Personally, I'd rather have a launched coaster than one with a vertical lift hill, but we'll see.
Pure speculation, but I do wonder if there was the possibility of a 2-coaster deal with Intamin, that somehow got changed to a deal with Gerstlauer. There was the rumour that a Hot Racer had been sold to the UK, and the initial "planning" document, if you like, had an Intamin Water Coaster on it. It would have to have been a lot smaller than the existing ones, but I guess it could be done.
For the 2027 ride, I think a Gerstlauer Airtime Coaster would be much better than a Water Coaster, personally, but I could definitely imagine a small SuperSplash like the one at Plopsaland.