There is xclicker which is a flatpak app, but it only automate mouse clicks, but there is nothing for key presses, I am surprised I could not find anything on this, but is there any GUI for this? Also is this possible on a technical level (in flatpak especially, I dont know if apps can simulate key presses). I know of ydotool, but that uses root, also its not a gui
Dunno if it would meet your needs, but I’ve been using Input Remapper for binding macros to various key presses and mouse buttons under Wayland. It does prompt for root access, but it’s a GUI. It supports any input method, as far as I can tell. It even supports my tablet.
I use it to bind stuff like
hold(key(BTN_LEFT).wait(100))to some button to repeatedly left click while I’m holding that button down.