Hello, I must say this is my first experience with the champion system and it's really fun. I don't have many suggestions but as far as making it a little harder to champion in the first place...you could impose a minimum alignment component for the status. This would require some effort and time before allowing you to become a champ.
As uniques are a little limited, tying status to kills would seem to be a better idea to me...not enough kills for your deity under your belt...loss of status. Having your alignment drop below a certain threshold....loss of status.
Just a few things off the top of my head....