EDIT:
I shall post another attempt here for critique
Scramble: U B2 R2 U L2 B2 L2 U2 L2 R2 U' F' U F2 L U F' L B2 U
On inverse with premove B2 L2,
U' F U2 F L2 F' L2//2x2x2 (7)
F U' L F' L'//2x2x3 (5)
R' U R' U2 R2//f2l3
Back to normal scramble:
Aaaand I have no idea how to revert back to the normal scramble. Dang. Help?
Scramble:
U B2 R2 U L2 B2 L2 U2 L2 R2 U' F' U F2 L U F' L B2 U
First stuff on normal (premoves on normal are stuff done in inverse mode and premoves on inverse are stuff done in normal mode) L2 B2, add it at the right of the scramble
U B2 R2 U L2 B2 L2 U2 L2 R2 U' F' U F2 L U F' L B2 U L2 B2
Then perform all that "new scramble" backwards.
B2 L2 U' B2 L' F U' L' F2 U' F U R2 L2 U2 L2 B2 L2 U' R2 B2 U'
Now second stuff on inverse:
U' F U2 F L2 F' L2 F U' L F' L' R' U R' U2 R2
To get back to normal scramble, put
all that at the right of the whole thing that you just did backwards to switch to inverse, like this:
B2 L2
U' B2 L' F U' L' F2 U' F U R2 L2 U2 L2 B2 L2 U' R2 B2 U' U' F U2 F L2 F' L2 F U' L F' L' R' U R' U2 R2
Aaand perform that backwards and you now are on the normal... Do this every time you want to switch from one mode to the other.
Then, at the end, you write all the thing that is on the
right of the scramble, then write the thing that is on the
left of the scramble like it is,
without reversing it (like correcting premoves) and reverse the whole solve
if you finished in inverse mode.[/B]
...
It is like this:
Scramble:
F U R
Stuff on normal: R'
Switch to inverse:
F U R R' performed backwards, R
R' U' F'
Then stuff on inverse: F U
Switch back to normal:
R
R' U' F' F U performed backwards, U' F'
F U R R'
Then your full solve will be R' U' F'.
Hope you understand it

(And hope that all that thing that I wrote is correct xD)