With the Hi10 XR, Chuwi offers a convertible that supports pen input and a detachable keyboard. Its Celeron N4120 processor should keep things ticking over too, as should its 6 GB of RAM.
https://www.notebookcheck.net/Chuwi-Hi10-XR-A-Windows-tablet-with-pen-support-and-a-detachable-keyboard.517284.0.html