You don't need to accelerate you just need to increase you slip stream. The combination of that and ground effect will sort the problem out.
And your into a wind sheer event if your getting that much instant change in wind speed.
And your all focusing on "stall speed" when you should be thinking about stall attitude. If you have the picture right and maintain it you won't stall.
And the size of gusts you are talking about 30-40knts you will only get in gust front infront of continetal CB's. And in those conditions I would be questioning your airmanship attempting an approach anyway. Yes we do get gust of 20-30knts in the UK but its in wx conditions that no GA will be airbourne. Thats middle of winter western isles and Shetland wx when the seagulls are grounded.
It seems to me the we have a group of experenced instructors and big tin drivers who have flown in these conditions many times saying don't add anything. And a group of GA only drivers who say add it in or you will die.