Efforts to control pronouns will likely backfire since a transgender-unfriendly harasser could use the legally required pronouns but still harass in other ways.  

It gives the harasser an opportunity for cover (i.e. 'I always use the correct pronoun for that person') you likely do not intend. 

This is not to mention that 'pronoun abuse' will be difficult to measure or prove, and our legal system is clogged enough as it is.   When someone set in their ways (due to religion or upbringing) refuses to use the correct pronoun, are you going to find fault?

Education and time, not legislation, is the usual course of action here, no?