I had two BlackBerry devices for work, right about the time they were going away. I’d heard the keyboard was good on earlier models but it seemed like the quality had gotten pretty cheap on the later phones. The BlackBerry 10 OS on my last phone was actually pretty good, and probably would’ve kept them in the market if they’d launched it 5 years earlier.
You can get these folding keyboards that will fit in a pocket, often have a roughly-cell-phone-sized case.
https://www.amazon.com/s?k=folding+keyboard
Still another item to carry, but it might fit the niche you’re looking for better if you’re not happy with hauling a regular 60% keyboard. Larger than those Blackberry-style thumbboards.