Smaller capacity bikes are becoming popular again in the UK, thanks in no small part to Triumph with their 400s. They never went away, of course, and in 2018, a joint development project with TVS in India saw the launch of the BMW G 310 GS.
The baby GS has a 313cc single cylinder engine with 34 bhp that might propel just you to 90 mph with a decent tail wind. Small means agile though - the bike weighs just 169kg.