[porkynator]

1.
Scramble: R' U' F R L' U B' D' L2 D L' B D' F2 U F2 R2 U R2 D' F2 B2 U' R' U' F
Solution: D2 U R' D' R' F2 D2 R2 D2 L2 U' F2 R2 D' B2 L D B2 D2 F' U' L' (22)

(L U F) //EO + square (3/3)
(D2 B2 D') //2x2x2 - blockino (3/6)
(L') D2 U R' D' R //DR (6/12)
(B2 D R2 F2 U) // HTR (5/17)
(L2 D2 R2 D2 F2 R2) //FIN (6-1/22)

There was a findable 21 (optimal after the first 7 moves), but I missed it:

(L U F) //EO + square (3/3)
(D2 B2 D') //2x2x2 - "blockino" (3/6)
(L') U [2] D2 R' D' R //DR (6/12)
D B2 U2 F2 U2 D' B2 [1] //3e (7/19)

[1] = [2] = S2

I had the skeleton but I did not try inserting with slices.