SH3Cmdr doesn't allow editing *player* medals - that would be blatant cheating.
I've forgotten now how to change Basic.cfg to ensure that you "naturally" get the badge earlier, but it's easy enough to add through a simple file change.
Open your career's "Careers_0.cfg" file and look for the last block (assuming you haven't just reverted to a previous save).
Look for the 10 "Medal*=" lines.
Medal0=4
;gives you Iron Cross Class 2
Medal1=5
;gives you Iron Cross Class 1
Medal2=6
;gives you Knight's Cross
Medal3=7
;gives you Knight's Cross w/ Oak Leaves
Medal4=8
;gives you Knight's Cross w/ Oak Leaves and Swords
Medal5=9
;gives you Knight's Cross w/ Oak Leaves, Swords and Diamonds
Medal6=10
;gives you Knight's Cross w/ Golden Oak Leaves, Swords and Diamonds
Medal7=1
;gives you U-Boat Badge
Medal8=2
;gives you U-Boat Front Clasp
Medal9=3
;gives you German Cross
Done.