Normal stall recovery with application of power would be sufficient, or if not, trading altitude for speed would give both increased airspeed, and a wider acceptable speed range.
A word of caution: "normal stall recovery techniques" that line pilots usually see are demonstrations of recovery for relatively low altitudes, where there is usually plenty of excess thrust available to recover with minimal altitude loss. This is rarely going to be the case for a high altitude stall - in fact, getting behind the "power curve" is very likely - which means that trading altitude for speed is the only reliable recovery technique in many cases; you won't be able to just power your way out of trouble. The key is to get the nose down and reduce the AOA as soon as you know you're in trouble; speed itself won't cause a stall, AOA is the problem, so directly attacking the source of the problem is the surest approach.