The industry standard, based on extensive research and manufacturers input, is to retain the existing configuration;
AC 00-54.
If there is a guidance system, AP or FD, then use it. The manufacturer’s certification tests should have considered speed excursions during certification, i.e. probability of flap exceedance vs damage, or likelihood of encountering such a gross speed deviation vs the survivability in such a severe encounter.
In this
(Windshear-Encounter) the crew followed the required recovery procedure (no computed guidance) and survived. Also, note that the FDR analysis showed that this actual encounter was very similar to the FAA simulated training model which was based on the infamous DFW accident.
Also see
https://www.scribd.com/doc/232325774/Windshear