Method:
Melted the shea and coconut butter together in a large Pyrex measuring jug, using the microwave on 30sec bursts, sort of stirring in between.
Once completely melted, transferred the melted oils to a stainless steel mixing bowl and stirred until clear. Let cool for a few minutes.
Stirred in the jojoba oil and then the fragrance oil.
The mixture is now sitting in the freezer hardening. It'll probably take about 30min to set to the goal consistency of soft butter.
Yay! It worked!