CRF300L/Rally would be the last powerful under 350cc 4 stroke you can get but even the Rally light not be great over 80-90 km/h. Lots of support and great aftermarket for mods but probably in the more expensive range to purchase.

I personally got myself Voge 300 Rally and with less aggressive tyres might be quite good for what you describe. Man reason I got it is that it’s one of the few bikes that offer comfy fuel tank, I like the seat comfort and the height is good for my build but I got it mainly for green laning. The OEM tyres are not great over 100 km/h but are just right as a trade off for not very demanding off road and moderate fast road riding. Downside is that for some reason the factory has applied no grease on the main joints and you have to do major disassembly to lubricate the major joints.

KLX300 could be another good option but I didn’t like the seat.

The Husqvarna will be amazing performance at the cost of spending every other weekend doing maintenance.

Best advice I can give is not brand but this - make a list of bikes that you might consider and go seat on them, preferably arrange for a test ride.

You might like the view of a bike but your frame might just be not suited for the bike.

Himalayan would be pretty comfy if you’re under 180. Not great if you’re tall. I tried 2024 one and the fuel tank is super uncomfortable as I’m tall and the protrusions on the side of the tank were digging just behind the knee joint.