I guess there are just a few modern, aircooled bikes that somewhat resemble our XSes. W650/800, RE650, Triump aircooled twins, and Ducati Scrambler. The latter being my favorite, due to weight and performance. Here is a report of a hopped up one, from Germany's #1 Ducati tuner:
https://www.ducati-kaemna.de/tuning/best-practice/2-ventiler/ducati-scrambler-800-tuning-big-bore
https://www.ducati-kaemna.de/tuning/best-practice/2-ventiler/ducati-scrambler-800-tuning-big-bore