There is always a need for a small Bluetooth keyboard and it helps if there is a Touchpad. Jelly Comb manufacture the B-003, a foldable, Tri-fold, Triple, Wireless, Ultra-Slim, portable, Bluetooth 3.0, Keyboard with touchpad for Tablets and Smartphones. I plan to use this for Dex on my Samsung Galaxy S10+ (or Hauwei’s EMUI Desktop if a new tablet arrives in the next few months)

The Jelly Comb Foldable Portable Bluetooth Keyboard features:

Touchpad Function – You don’t need a mouse to operate your device, very convenience and mini size for the user. Special Note: no touchpad function for the devices of IOS/OS systems
Foldable design – Made of aluminum excellent material, ultra slim foldable design and pocket size. Keyboard Open Size: 304.597.958mm, Touchpad Size:54.8*44.8mm
Exquisite workmanship – from Aircraft grade aluminum for superior stiffness, light, and fast heat dissipation, sleek and sleek design
Compatibility – QWERTY layout with hotkeys, compatible with iOS / Mac OS, Android, Windows, and all Bluetooth enabled devices
Bluetooth performance – Using the advanced Bluetooth 3.0 chip, providing high-speed connection and signal distance up to 15m

You can pick on up from Amazon here for £23