I can understand that 100% 1” 4SH premium cannot be replaced.
My suggestion will be as under against OC sac160062
1” 4SH Premium -> reduce from 5000m to 3500m ££
¾” 4SH Premium-> add 2000m
££ 1”4SH Premium can be further reduced if you can get 3500-5000m of ¾” 2SN allotted for us from braided hose capacity
We require SAC160009-1. There is no change in this OC.