2 things.
First, IME, anything you want to keep? You can. It typically takes a whole helluva lot of work to blunt any symptom set, and they still come back.
Second, I've learned to draw a line between hypervigilance and vigilance, since being here on this forum. One thing I've realized, parsing what just effing worked the last time I got my head on straight, is that I didn't "keep" my hypervig. I retrained my vigilance. So that I could relax, and just count on my mind to "pop" or "grab" anything that was out of the ordinary. I could keep track of a screaming-running-roiling-puppy pile of kids with one eye (knowing absolutely everything that's going on with them and around them) whilst still going about my life. Whether that's in the middle of them or ... The same way I could keep track of everything going on around me in a firefight or sports match. Situational awareness to the Nth degree, running hawt as f*ck, and always accurately pinging information I needed, when I needed it, now. This is very much opposed to hypervig making shopping in the market impossible, because everything is pinging / can't see-hear-think-move, bursting awake because a mosquito farted half a mile away (but so freaking exhausted, and so used to false alarms, I'm sleeping through true emergencies).
So for myself, I very much encourage & work on retraining / solidifying the one, while sanding away as much as possible the other. How? By using my vig as much as possible. And when I kick up into hypervig? Deliberately slowing things down to sort them manually.
Vigilance? Useful.
Hypervig? Life wrecking.