I've ridden a mates CB400 a few times, I'm 6" and 80kg so was pretty comical, the thing would bottom out and scrape pegs all over the place but was kinda fun my current bikes are a street triple and a ktm 990 smt. tbh not sure if I'd recommend the adventure for what you are looking for. the 990 motors are loads of fun to use but are pretty thirsty and service intervals are 6k/12k and very expensive. Fairly heavy clutch on mine as well and the engine is a pig below 3k rpm. Kinda why I like it, you have to ride around some of it's issues then it's really amazing. A CBR600F would be a great step up if there's one around with ABS. My neighbour upgraded his xj6 (yuck) to one recently and really loves it.