THIS! Many seem to almost fantasize about them coming to the door to get them. That does not happen and will not happen. When the boys come to the door something else brought them. Now if you have something that is currently not "OK" and they come? Yes they can and have used that to put another charge on. For those who keep stuff they know they should not have a couple things they should not do. One post pictures of them smiling with the stuff in hand, another ever use it for a defensive shoot.With the injunctions... and if you are a member of one of those organizations then you can still have your brace on your pistol... without a tax stamp. Just as before.
There is a bit of a caveat there too though with owning a pistol and owning a brace. Simple possession isn't necessarily "constructive possession", but... say you keep them both in the same drawer/bag or secured in your trunk together... such that it's reasonable to assume your intent is to use "that" brace on "that" pistol it may still be considered constructive possession. The key there really seems to be what a LE official might consider "reasonable intent".
You can overthink yourself scared, but the reality is more likely that If the alphabet is knocking on your door with a search warrant, you have a lot more to worry about than a simple constructive possession charge. Keep your nose clean and it's more likely to remain a non-issue. YMMV