You'll want a two-stage system of some sort anyhow. There's a fundamental tradeoff between the ability to carry the fuel needed to gain height, maneuver into th

You'll want a two-stage system of some sort anyhow. There's a fundamental tradeoff between the ability to carry the fuel needed to gain height, maneuver into the correct position/heading/speed, loiter, etc, and to have the extreme power-to-weight ratio and maneuverability for a suicidal final attack run. A plane that is flying high enough and can travel fast enough is essentially immune to ground-based interception. Your launch has to spend a significant amount of time and energy just to get high enough, and launches like this are extremely loud to the defending plane's sensors. If you launch too early they can just turn around and fly out of range; too late, and they can overfly and outrun your range. Essentially, the position + velocity interception state space for smaller kamikaze designs does not necessarily include ground level & stationary for a large portion of the design space. And once you start up-scaling things to get the endurance necessary to attempt intercepts, then you lose the maneuverability and cost advantage for making kamikaze attacks, and attaching parasitic missiles or drone aircraft for the final attack run makes a ton of sense.