There's no way to win at this point, except to go back to pre-brace life and make sure you do not own anything, or combination of things that could be constructed to make an SBR. Before braces were around, no one wanted to own an upper with a barrel < 16" because even if you just put it in your safe, etc. you were risking getting in trouble by having the items to easily construct an SBR.
Once you take into account the ATF redefining things at will, just removing the and even destroying the brace, means you still probably have all the parts (assuming you own an 16" AR with a non-brace stock) to construct an SBR in minutes in your possession and likely within close proximity.
So let's say you own a braced 8" pistol AR, you remove and destroy the brace, but you also own a 16" AR. Given what we've seen and all the concern about the ATF redefining things and changing the rules on whims, how long before the ATF decides it's not okay just removing and destroying the brace, when in less than a minute you could slap that 8" upper on your other AR and construct an SBR?
Anyone that owns a braced gun with a <16" barrel that also owns another gun with a fixed stock that can exchange lowers/uppers, should also be very concerned about the ATF deciding that you can all too easy construct an SBR out of things you have in your possession.