Since there was no online multiplayer support, the MakeCode Arcade kiosk solution under development is probably a subject more befitting to this thread about playing MCA games in/as app.
Maybe, as @personalnote is on to, that this could be bundled/framed/compiled/packaged somehow to run as a cross platform and offline app/PWA, and a possible solution alternative to what @Pixiloom is searching for?:
By the way: Anyone who lately has gained any experience or new knowledge about the mysterious experimental/beta VM option in the hardware selection menu in the editor?