First off, an issue with the proposal - since rules against mounting enemy faction equipment have been abolished in favor of the tech/shipcompat plugins, you will see hordes of traders and miners gladly acquiring these inexpensive "pirate scanners" in exchange for a 10% core modifier - a small price to pay, especially for those who rarely using their guns, are in 5kers, already fly above/under plane, or are silent and just opt to lose their cargo.
Yes, it's often "pirate RP" to run from the law, but with all pirates equipping these scanners, interaction with law enforcement will be purely optional - snubs fast enough to intercept can't use them and capital ships are either slower or have no disruptors. Now, if there were to be a review of cloaking device requirements/duration/rules for lawfuls and unlawfuls to negate the scanners, that might mix things up a bit (but I know there's a can of worms there).
Unless this is a proposal to make BS scanners on transports a sanctionable offense, they are going to be used one way or the other - at least the high cost limits it to wealthier traders (and even then, many do not use them). Similar to the trade lane discussion, this will be a community-wide change to penalize an irritating minority. Limitations on traders who fly above/below plane, use BS scanners, or use other methods to avoid interaction will not force them to interact and bring rich RP - they'll simply die silently and resume trading, only fly easy/safe routes, watch the player list for empty systems, or stop playing altogether.