Monk fruit may be promising, there has been studies in Mice where Monk Fruit even lowered blood sugar levels. However, I agree more studies must be completed.

Another study including Aspartame, monk fruit, stevia and sucrose was kind of interesting which showed sucrose (as expected) had the biggest insulin spike, but interestingly the participants made up for the sucrose calories in their next meal and actually had higher insulin spikes in the subsequent meal compared to the sucrose group. https://www.ncbi.nlm.nih.gov/pubmed/27956737

Probably best to avoid all sweeteners.