I3wm with xfce or kde or something? Works really well together. Closing and moving windows, or better toggleling floating mode, can be done with middle mouse button or right mouse button.
You will have start button and gui of xfce but all the control of i3wm for windows. I used it that way before switching to i3 on endavouros.
I heard in shift's stream there is a console option for portals on moving objects. I'm with you, i guess it might not be implemented fully. And it is not enabled in the original game.
times is for cartesian product, cdot if i feel like it