Focusing on your budget and conditions and also choices, Versys 250 is the best choice for pillion riders. Wind or airflow resistance maybe an issue due to rear seat height but I think should be good enough to sustain.
Tens of other models are also available but let's just focus on your budget and conditions ... 😁😊😊😁

My height is at 166cm and I'm riding an adventure bike.
My pillion rider prefers adventure bike comparing to lower retro ones.
At this height, riding an adventure bikes is always challenging but worth the nervousness.
Putting 2 feet flat on the ground is impossible. No matter how much I may say that I'm ok, I would always sweating nervously when riding in the traffic 🤣🤣🤣
The 250 might be a good choice but if you're eyeing on 650, I would propose you to wait a little longer and get the 650. 😁😁