As an f driver... I ask but why?I appreciate your thought on this, but the numbers I came up with are a little lower. There were about 7000 180 & 200 HP Mooneys made, about 5000 of those are short body Cs & Es. 1% of that is 50-70 units. That would be the number who would find value in a soft stall and speed reduction on landing, and that could pay for the cost involved in development and production.
You're going to add to empty weight to decrease stall speed, without a corresponding increase in MTOW.
I suggest you inquire over at mooneyspace about the need... I think you'll be enlightened by the market research.