I believe it'd be best to do separate libs for

sky130_osu_sc_18T

,

sky130_osu_sc_15T

, etc. Perhaps it would be better to even split up the tracks into

sky130_osu_sc_18T_hs

,

sky130_osu_sc_18T_ms

,

sky130_osu_sc_18T_ls

. I would personally do so if given the choice, but I don't see why they couldn't be mixed within the same design, so there's nothing wrong with packaging them all up as

18T