With i3, that isn’t as simple, since i3 doesn’t support Wayland. You’d need to install a WM which supports Wayland + customize it, to be able to switch back and forth.
While it’s not as simple as KDE, switching from i3 isn’t that hard thanks to Sway. It’s a tiling window manager that’s intended to be used as a drop-in replacement for i3 on Wayland: