tournesol Re – “If you have been in icing conditions for an extended period of time, and at 50ft you fly below Vref, you will drop like stone”.
Your explanation perhaps states the obvious.
Certification requirements cover these points, and require manufacturers to determine any change in stall speed and publish procedures relating to this.
CS 25, AMC 25.21,
4.4.2. c. Changes in operating speeds due to flight in icing conditions.
6.8 Landing (CS 25.125). The effect of landing speed increase on the landing distance may be determined by a suitable analysis.
The AFM or operating manual should have information on the approach and landing speeds (or additions) to be used in icing conditions and the effect on landing distance required.
Some manufacturers have specific speed additives for approaches made in severe icing conditions (where the de/anti icing system can be overwhelmed); again, landing distance corrections are required.
Re “I am of the opinion to fly at Vref + all the corrections (wind and gust) and bleed the speed off during the flare and touch down at Vref +the gust factor.”
This belief might result in an overrun, as all of your excesses will reduce the landing distance safety margin. I suggest that you study the references above and the guidance in
‘Managing Threats and Errors During Approach and Landing’.