Agree with Dunnyrail and others. Apart from getting one 3D printed - a REAL possibility that I can ask about here and on the 16mm FB pages [I will], you are left with scratch-building from somebody like Mike the engine builder - looking at maybe a couple of REALLY big ones for it in that case. Buying the Accucraft model and taking out the offending bit, as Dunnyrail suggests, is also no cheap - £1500+ for the loco at the moment.
If you could tell us EXACTLY what you want, then help is here - and there.