Reason the cones are there was the original design engine had sort of somewhat subsonic air intake requirements. Things get stupid at mach 4+ so they stayed. People that I knew that flew these said a relight every so often was a mandatory flight requirement. A no relight flight was akin to a smooth no bounce landing: once every once in a while is great, after the third one, you are tempting fate to smite you.
You don't need a cone, just a profile triangle would suffice for looks. If they wings are too small then you just need more thrust