In order to make an evaluation system for officials work in you area would a "minimum qualification" for coaches satisfy your concerns? (I am not including the rules clinic held by the SCHSL for coaches.)
I think as a community the coaches, with the exception of a few, would accept this. The reality is that many coaches and officials are highly qualified.
Unfortunately, I believe that the SCHSL has created an adversarial relationship between coaches/players and officials. As Kyle stated earlier, " This would be more work for the SCHSL". Coaches and officials working together may have a greater chance of succuess in changing the attitudes and perceptions at the SCHSL.