The question is, do I keep Thr MCT/Op Desc or Reduce thrust lever to Idle to descend with Thr Idle/Op Desc.
Re-engage the ATHR and descend in THR IDLE/ OP DES (thrust lever to idle will obviously work as well but it's one more thing to forget in the excitement later on, and this is one situation where maximum use of automation wouldn't be a bad plan).
But this will give you a descent at MCT (about 1700FPM maybe)
Obviously depends on a few factors, but RoD will be significantly lower than 1000fpm with the remaining engine at MCT.