Considering your options I think Mudmouse has the best solution He adapted a S 111 drive flange to the isuzu flange.A aftermarket salisbury flange would be better You could Oring the screw on cap ,fill with one shot grease and be good for years .Strength wise it has a lot easier job than an axle which seem to last ok and any slight misalignment problem tolerated as well as you can use better steel with no heat treatment problems
Noel

