2) You are asking the Federal government to suppress states' rights and get involved in making and/or overturning state law? Seems like the wrong avenue to take. The Federal government allows states to have stricter laws than the feds when those laws concern NFA items. You need to fight in the state to get them to overturn its ban on certain NFA items.
3) You could fight the ban in the Federal courts, but I don't see that going very well -- our courts no longer recognize the Constitution. This is quite different than asking the President to change a state law of course, and is really the only other option other than what was mentioned above.