(D L' R U') //EO
(B D2 B' R2 B L') //DR 10+2 4c4e
(F2 U2 B' L2 D2 B') //HTR
(U2 L2 F2 L2 F2) //finish

First thing to try on the inverse scramble is a 21 and there really isn't more.
Lot's of people didn't know the 5-move shape it seems.
Rare 2q solution to 4b2 4e.

B2 L2 U' L R //EO
(F2 B2 U' L2 D) //DR 10+2 4c4e, crazy variations on the EO side
(F R2 U2 F') //HTR
(L R D2 R2 B2 U2 F2 L R) //finish, found it by doing (L R) and then switching for the variations of the EO

This is DR as well as:
R L' B
U D (F2 B2 D' B2 D) //10+2
are related to eachother as they both come from (F2 B2 U' L2 D) //DR-1s.
Theres also short DRs from fixing it all on inverse:
(F2 B2 U' L2 D F R2 U2 F' R L) //this 11+1 that leads to the same 19 as well as like a million other short DRs

I fount this 19 at around 30min, but at the time I was certain that there must be something even better here.
Turns out there weren't any sub-19s afterall, as none of these seem sensible to me at the moment:
nissy-# solve -t 8 -M 18 R' U' F L F L' R' D2 U2 F2 R' D2 R' D R' F' D' L2 B2 F R' B' R' U' F
D L F' U F U' D' F R' D2 B2 L2 B L2 U2 L2 U' (17)
L' U2 L' U' L U' D R2 U2 B' U B' F2 U' L U2 B' U (18)
L B2 U2 R2 D2 R F' U' L D R B2 R D' F' L2 F' U2 (18)
L' U' R U L D R2 L U' D F U B U' B2 U' F' U2 (18)
R2 B2 L' F B2 D2 R' D' R' F' L B' U2 D L D L' U' (18)
U L B U R B U2 D' F2 B U' L' D B' D' L B2 D' (18)
D' L' F2 D' L' U' L2 D R F' U2 R' F' L2 R' U F2 D' (18)
L' B2 R' F D' B' U R' F' B2 L' D' U2 F U2 B F2 D' (18)
U R U B' U' L2 D' B2 L U' R L' U2 B' D L D2 R2 (18)
U F U F' R D2 R2 F' R' F2 R' F' D2 L D2 F' U R' (18)
F2 L' F2 R B' L' B2 U' L' D2 L2 D' B2 L' D L' F2 R' (18)
R L2 U' F2 R' U L' D L2 U2 B2 U2 L' B' U2 B2 U' B2 (18)
D R' F2 B' R L U' D B' U2 L2 B' U2 R D2 L' U B' (18)
D L U' D F' B' R2 L' F U2 L2 B' U2 R D2 L' U B' (18)