Question for low carb/keto Kiwi's

My wife and I have switched to low/carb keto eating, and it's been amazing so far.

One thing we would like to experiment with is the occasional keto dessert. Almost every recipe we find includes an artificial/calorie free sweetener like stevia.

So far the stevia I've tried has a weird bitter/sour taste that destroys the flavour of whatever it's in. Does anyone have any recommendations on where/what artificial sweeteners are best for baking (and are available in NZ)? I think the stevia I tried was specific to that brand - I know that the leaf it comes from is very bitter.

FYI: I live in Auckland if that's relevant to places to go etc.