Re: Real life playing out one of my ideas.
You could plan ahead to reduce your radar cross section even more. Replace your standing rigging with non-metallic shrouds and stays. Take a piece of metal flashing and make a cylindrical shroud to fit over your engine.
You could reduce IR emissions from your engine by insulating the engine compartment.
Reduce visibility of your sails by making them grey rather than white. My mast is black, I'd paint it grey.
Years ago (1986), I worked for a defense contractor who did stuff calculating radar cross sections. I once kidded my boss, "You fire me and I'll go to South America and use your tech to make DC3s into stealth aircraft". I nearly lost my security clearance for that crack.