Lenovo ThinkPad X1 Yoga 2nd Gen i7-7600u 2.80GHz

"Indeed I am worried dealing with the Biab GUI on a 13 " touchscreen. Handling input with fingers will probably not work - will it?"

You should be. Just for playback, it will be OK. For arranging, as I mentioned, it would not be a good choice as it's not optimized for touch screens. The Yoga I mentioned is 14". 1" difference might not seem like much, but it does make huge difference.