I would like to have a numeric keypad as a remote input. Most laptops do not have a numeric keypad. Numbers are not directly available either on the French keyboard as they require holding Shift. This make it very inconvenient to insert a lot of numbers in a spreadsheet. It is currently possible to have a soft keyboard on the remote input activity. However keys are quite small as there are many other key than numbers. I suggest to add a keypad icon (3x3 dots + 1 bottom middle dot) which trigger the soft numeric keypad. The native numeric keypad is automatically displayed for example when filling <input type="number"> html5 form fields with a modern browser (https://www.w3schools.com/html/tryit.asp?filename=tryhtml_input_number).
This is already possible, if your keyboard supports this. For example, Swype and GBoard support this. On Swype: swype from swype button to "5" button. On Gboard: see https://androidforums.com/threads/google-keyboard-how-to-change-to-number-pad.804201/