The ultimate manned interceptor

That thread about the point defense fighter made me think back to the mid/late-1950’s when a lot of work for rocket&ramjet interceptors and ramjet SAMs was done.

So I thought about the ultimate manned interceptor and came up with this (retro-technology, quite funny to speculate about):
A highly supersonic (Mach 4+) two-seater with a MTOW anywhere from 45 to 65 metric tons, with a single internal JP/LOX-rocket engine (aerospike today) fed from three external tanks (2x JP, 1x LOX) for the start phase (vertical from an hardend underground launch pad) and acceleration to supersonic speeds (when the external tanks are jettisoned), plus two ramjet (or pulsed ramjet or scramjets today) which cut in as soon as the aircraft goes supersonic and accelerate the interceptor to its mission speed. Imagine something like the A-11 with a rocket in its tail, and pure ramjets instead of turbojet/ramjet-hybrids.
The beauty of that concept is, that there are hardly any moving parts, even the landing gear is only designed for an empty weight landing. The empty/MTOW ratio would be around 3 to 1. And the wing is only needed for the landing, because at highly supersonic speeds you don’t need no wings at all, so the wings could be quite small.
Armed would that thing be with six large, highly supersonic (Mach 6+) long range IR/SARH-AAMs with radiation-enhanced nuclear warheads (= neutron bomb, like Sprint and Genie had) guided by the powerful radar of the interceptor and an internal IR-sensor (quite tricky at M6+ I guess).
Mission altitude would be 70.000ft+, mission speed M4+, range at least one hour outbound, which translates into about 2500nm radius.
On the homebound leg it would go slower (Mach 2 or so), and do an automated unpowered landing.
With 150 or so of these interceptors stationed south of the DEW-line of these interceptors you could have defended North American airspace against intruders quite nicely. And quite expensive.

Nice. Isn’t it?