I’ve just seen this thread, and I am interested in the kick-starting you managed to achieve, my brief efforts a while ago failed miserably.
My first BMW (circa 1975) was an R60(5)..This was my first bike with electric start, but I rarely used it thinking I would wear it out, so used it sparingly if say late for work; needless to say kick starting it was easy.
TBH I was scared off of trying too vigorously, being warned the alloy kick pedal was prone to break..
But, you have piqued my interest..

Practice methinks.