I think Jonno will come up with a proven solution to this.
To start with the premise it can't be done means you don't develop things further, if we have a maximum peripheral speed of the weapon and an idea of the mass being thrown,
Jonno can do experiments to prove the system works; the FRA will oversee the results and make a decision on it based on proven repeatable tests,
I€™m not saying it can be done, what I am saying is lets try.