Never seen an adapter out there, but the pumps that Down river equipment sells, with the metal hose ends, work well with military valves. If you were to go with some sort of adapter, metal will slide better in the valve when you close, it then rubber does.
Maybe someone wants to trade you pumps, rubber end works way better with c-7's, since you can just jam it in there, and it will stay.
I would forgo the razor blade.
We can't always agree, but we can still be civil to each other.