IMO it's going to take MUCH more than an NFL boycott to affect that kind of legislation. Also, holding anyone as "guilty until proven innocent" in any circumstance is a dangerous precedent.
My goal is to boycott until the NFL
-Runs public service ads informing people of their rights in police encounters (similar to their domestic violence campaign)
-Allows players to use the NFL as a platform to express their personal beliefs without censure (This could be symbolized by a team signing Kapernick)
-Starts a legal fund for the victims of police shootings and their families
-Unilaterally stands up to the police and essentially says "Denying our fans protection because of the opinions of certain players is a flagrant violation of the 1st Amendment. Now get your ass to the stadium, suit up and do your fucking jobs!"
I actually agree with you on the holding anyone as "guilty until proven innocent" in any circumstance is a dangerous precedent, however the judicial system in the US tends to treat black people with the notion of "presumed guilt" as opposed to "presumed innocence."
Your ideas are good, however, there are several police officers who feel that they are "above the law," and do not value black lives. History shows you that little to no punishment will be incurred by police wrongdoings because blacks in the US are painted as the proverbial "Boogieman." In addition, this "Boogieman" theory is not lost on the judges or prosecutors either and this extends to jury selection also. Drafting specific legislation may not be the end all be all, but it will surely make the police think twice about pulling the trigger (or choking someone out).
They are feeling it now. Never eat there again.