You can run emacs on WSL and just pass the X output to windows using an X server like VcXsrv. This works pretty seamless for me, no noticeable lag or anything.
This works very well. Another thing I do that works well, and I don't really see it brought up anywhere, is to use nomachine to connect to localhost. It's not seamless in the sense that you have linux apps side-by-side with native windows, but it gives you a full linux desktop experience (you need to install a linux desktop and wm in wsl for this to work well). Combining this with windows virtual desktop i can flip back and forth between windows and linux instantly without any vm.