I am lucky to have a bar freezer, where I have 12 different Gins and Vodkas living in the chill.

I would think you would need very little sugar or simple syrup if you are using sweet orange liquor. If it is too edgy it may help, but start with little if you like tart and then tone it down to taste.

I am on the Charlie Harper style not drinking tonight (only beer and wine). I now have this and Gimlets on my mind, will have to work on these two this week.

Let me know how this turns out and what changes you make.
Todd