Well, I answered my own question.
I puttered around in the kitchen and came up with my own sugar free tomato preserves recipe and I like the seasonings I came up with on the first try. I went from the memory of the seasonings in an old friend's full sugar recipe. (He's now deceased so I couldn't ask him.)
Sugar free tomato preserves
makes about 6 tablespoons
Important note: if using a sweetener that is not heat stable--such as Equal-- add at the end of cooking to retain full sweetening power and prevent bitterness.
one cup well drained crushed tomatoes (I used home canned)
1/8 teaspoon each ground mild chili powder, cumin, ginger, allspice and cinnamon
1 packet (equivalent sweetening of 2 teaspoons sugar) artificial sweetener
1. Drain tomatoes well and cook in a small saucepan over medium heat, stirring often, until very little liquid remains and tomatoes are the consistency of a jam or fruit preserves.
2. Remove from heat
3. Either combine well the spices and sweetener in a separate bowl and add to the tomatoes, stirring well to combine OR simply add the spices and sweetener one at a time, stirring well after each addition.
Cool and store in a small covered container in the fridge
Nutrition counts per tablespoon using home canned tomatoes as I did
Total fat .05g
Saturated fat .02g
Polyunsaturated fat .02g
Total carbohydrates 2.9g
Net carbohydrates 2.15g