If it is RTN you are likely already too late. If STN you shouldn't do what you plan to do. It will further shock the coral, and leave you little chance of saving it.
Every acropora I have ever had that STN-ed I lost entirely by trying this.
Every acropora except for one that I left in the tank eventually recovered, with a far more resilient returnee. I have a electric green colored pocillopora right now that is growing like gangbusters over the remnants of it's ancestor that STN-ed over 2 weeks. I believe only a couple of polyps survived from that (they were not visible). After about a month though they had regrown enough to be visible.
This was the 8th such coral in the 3 years since I had been taking this approach to have that result. Only 1 did not recover. All except for the pocillopora were acroporas or montiporas.
If it is STN I'd leave it untouched. If it doesn't come back, I can give you as large a frag as you want of green slimer. Though, in my pre-fire setup, I was unable to keep any green slimer alive and tried multiple times in multiple tank locations. Happily, now, I have 2 that grow like weeds.