A Bush C150? With Leading Edge Slats?

Hello, I have a long term goal of making a small bush plane: 450lbs
useful load, 35mph clean stall, 600 ft clear 50ft. I know there are
quite a few designs out there, PA-11 Cub, Bushcaddy, Zenith CH701 to
name a few that I'm kind of familiar. But here, I'm looking into the
possiblity of working it out on a c150.

First of all, I want to say that this C150 will have a much lower
gross when used for bush flying, I know it'll be 1400# with no mods
but I like to see if I could push it down to 1300#. And now I want to
tackle on one aspect this time, how to improve the wings to
significantly reduce the stall speed.

First a question, anyone knows how far away the C150 wings is from an
ideal high lift design, i.e., if you would design it again (keep the
area and weigh the same and also conventional shape etc) how much can
you lower the stall speed?

I'm guessing for a certain design the stall speed is proportional to
the square root of the wingloading. The stock C150 is 10lb/ft^2 and
stalls at 48mph, while, for example, it is 8.9 and 30mph for the
Bushcaddy R120. So if I trust the number, the wings for the Bushcaddy
must be way more more efficient than that of the C150. What's the deal
here?

Now the CH701 is interesting that it has a leading edge slats. I'm
wondering how much improvement you can make if you put one set on the
C150 wings? As far as I know, there is noboby working on that. (I'm
aware of the Dakota slotted wing for the Cubs.) But it does not look
like too difficult. Any slats expert here?

Oh, let's not worry about the FAA part for now.

Thanks,

Jizhong