I'm not sure that option 8 will be feasible. There are just too many of them coming on board because they heard from their friend that they can make a bunch of money throwing crap comments around.
One of the best things people can do for now is keep reporting the offenders to @steemcleaners. I would link to it here, but we just walked about external links. So, go to their Discord server and get the link there. Then you can know it's trustworthy.
You've got some great ideas. It doesn't make sense that it would be so hard to get them auto-grayed. There has been such an increase that Steemit is going to need to do something soon. It's not good for their product to have it's legitimacy constantly questioned. Shut down the impostors so we can just get back to Steeming.