Ominous Banner Prevents Patrol Spawning

I can't be the only person that plays hardcore (and thus cannot or will not turn off Patrol Spawning) and is constantly harassed by these dudes on my own turf, turf that has unsecured villagers with important trades.

Every player already has, in their own minds at least, the same idea "I'm going to put up this banner as a warning to the rest of them." The trouble is, it doesn't actually do that. Pillagers aren't even scared of ominous banners that are placed by the player.

I think this should be remedied. Ideally; I think that Ominous Banners should prevent pillager patrols from spawning within a certain radius. I think about 5 chunks square would be quite fair. Of course, this could be tuned down or up, perhaps it could even be difficulty dependant, where easy could potentially prevent spawns in a greater radius, hard in a lesser one, and hardcore mode an even lesser one; forcing the player to harvest banners in an attempt to prevent spawns in a greater area. 

If mojang were so inclined, perhaps adding the ominous banner to a shield would create a custom effect that makes pillagers scared of the player, similar to how creepers and skeletons are scared of cats and dogs respectively.