#1 with limit
A lot of one move pairs, but I couldn't find anything too nice, the best I found was this mess:
B' R' U' L D2 U2 B2 L U' F2 L D2 L2 D' F' U2 F D' F' U2 F L2 D L' D L D L' F U2 L' (31)
B' [Some EO]
Switch:
L U2 F' [EO]
Switch back:
R' U' L D2 U2 B2 L U' F2 [2x2x3]
L D2 L2.D2 L2 D L' D L D L' [L3C]
.=R' U R D' R' U' R D (Unfortunately optimal)
A lot of one move pairs, but I couldn't find anything too nice, the best I found was this mess:
B' R' U' L D2 U2 B2 L U' F2 L D2 L2 D' F' U2 F D' F' U2 F L2 D L' D L D L' F U2 L' (31)
B' [Some EO]
Switch:
L U2 F' [EO]
Switch back:
R' U' L D2 U2 B2 L U' F2 [2x2x3]
L D2 L2.D2 L2 D L' D L D L' [L3C]
.=R' U R D' R' U' R D (Unfortunately optimal)