Here I go just guessing again (didn't do me so well on the Flue Cured thread), but for a mild recipe I would try starting with:
2% FA Virginia
tobacco flavoring
2% FA Burley
tobacco flavoring
3% FA Vanilla Bourbon
1% FA Coconut
You could also add 2-3% PA Cotton Candy (ethyl maltol).
Here's what my guessing is based on:
The Wiki article says Cavendish is usually made from Virginia and/or Burley
tobacco.
The Black Cavendish I remember is mild, somewhat sweet and has a vanilla top note.
If you were making a small 3mL batch, the recipe would be:
2 drops (0.06mL) FA Virginia tobacco flavoring
2 drops (0.06mL) FA Burley tobacco flavoring
3 drops (0.09mL) FA Vanilla Bourbon
1 drop (0.03mL) FA Coconut
92 drops (2.76mL) total base
Think I'll try this one myself and see what it turns out like.