Ok. Airbus figures....
https://www.airbus.com/sites/g/files/jlcbta136/files/2021-11/Airbus-Commercial-Aircraft-AC-A350-900-1000.pdfSo worst case - the dash1000 - front slide length 10.25m, rear slide length 9.35m (2-8-0 Page 2) . Front sill height 5.05m, Rear sill height 5.29m. (2-3-0 Page 10) So angle of dangle when standing normally on all U/C is 30 degrees front and 34 degrees rear.
Nose wheel is 32.5m ahead of the MLG, 4.63m behind the nose and about 2.9m tall.(2-7-0 Page 13)
D4 is 59.53m behind the nose, and therefore 22.4m behind the MLG. (2-7-0 Page 5)
If the nose wheel 'fails' and the thing ends up nose down arse up, I think the trigonometry says the rear sill ends up roughly 2m higher - or about 7.29m up - assuming it's still on it's MLG. For a rear slide of 9.35m that's an angle of dangle of 51 degrees.
More difficult to calculate for a nose up arse down, but I'd be surprised if it's much better.