[xmonad] How to use virtual/on-screen keyboard in Xmonad

Hello, I would like to use Xmonad to set up a custom, very restricted desktop environment on a Raspberry Pi with a touch screen. Because there is no hardware keyboard I need a virtual keyboard. I tried these programs: xvkbd, matchbox-keyboard, onboard, florence Some of them work with some other programs. But when it works, it's still buggy: - after typing I have to click two times to a new input field to set focus - virtual keyboard steals focus - other windows get invisible and only come back when they get focus (super+j) - doesn't work at all with some programs Is there a way to get virtual keyboards work with Xmonad, reliably and for all programs? Thank you! Jakob