I eat single small figs fairly regularly without any problems. Tesco suggests 9.5g carbs per 100g for their figs, and that 2 "typical" figs weigh 70g = 6.65 g carbs, which to my mind is perfectly acceptable as long as you don;t eat too many at one go! But probably best to be wary of dried figs as generally dried fruit will have higher carb/sugar content.
Check Google for potassium rich veggiesand fruits as there are a fair number that would be suitable in addition to spinach; e.g. broccoli, mushrooms, courgettes, augbergines... I used to get bad leg cramps (sometimes still do) and bananas were my pre diabetes go-to solution - I was quite surprised at the number of other (often higher potassium) alternatives.
Robbity
PS Usual disclaimer regarding testing
your response to any new foods applies!