Whilst research of any sort is good (rotary wing ideas were scorned in 1923) there might be other ways of countering missiles, if that is really the aim of the exercise.
Has the countering of enemy missiles by more conventional means been exhausted? I thought SEAD technology was still being explored further etc.
If this is just a vanity project, then there are other areas which could use the money and as stated above, safely releasing a weapon at hyper speeds is a challenge - perhaps the idea is to chuck it out backwards or somesuch.
O-D