Microsoft would probably make them available if this were to happen, since they'd have to do work to get Windows running on the A-series chips anyway. If Apple

Microsoft would probably make them available if this were to happen, since they'd have to do work to get Windows running on the A-series chips anyway. If Apple wants it (and is willing to help, because some way of breaking their secure boot will be needed), it's beneficial for Microsoft. They get to sell more licenses, and corporate environments that buy Apple hardware to run Windows on (which is apparently not uncommon, according to r/sysadmin) will keep doing it.