This will increase the code length nothing else.
At my place i tried by forming the look up table for the same.
Define lookup table at some place which contains the codes for displayng the 0 to 9 digits on the display.
At the time of displaying get the data pointer for the lookup table & address it by puting the perticuler byte in the accumulator which has to be displayed.
Mov A,r0
Mov dptr,#1000h
Movc A,@A+dptr

A will have the code for the perticulay byte you wanted to display.