Mods:

Gauge - 31 rnds to 8.5 cm on leg slightly stretched on sock ruler.

CO 68 sts for cuff on smallest needles.
Worked 2x2 ribbing instead.
Worked 2 knit rnds MC before colorwork on largest needles.
Worked stranded colorwork on largest needles.
Worked 2 knit rnds MC between all colorwork charts and after finishing last chart on largest needles.
Worked main sock body 2x2 ribbing on middle size needles.
Worked 26 rnds for the leg to 6” in length.
Worked heel over 32 sts, separating so heel starts and ends with 1 purl st.
Worked the purl st as a knit st slipped on RS on either side of garter ribbing because I thought it would be easier to pick up for heel.
Worked gusset dec’s until there were 32 sts left.
Worked heel to 6” in length / 39 rnds.
Worked 2 sets of dec’s on the instep on 2 knit rnds before colorwork on toes with largest needles, so there are 32 sts on the instep and sole each - 64 sts total.