I love these strippers because they are very efficient and very easy to use with many different wire gauges.
https://www.amazon.com/Ideal-45-292-Stripmaster-Wire
Stripper/dp/B000NBA8GM/ref=sr_1_30?s=industrial&ie=UTF8&qid=1486560073&sr =1-30&keywords=wire+strippers
Also, if you absolutely have to, you can take a screwdriver and bend it in the form of a normal wago instead of purchasing one. I also find it helpful to have a good pair of wire cutters around as well.