I'm pretty sure i read about it with the three raf signit c130's cause they needed extended endurance but needed to swap netween potential fuelers.
But if the was a system where you could roll on roll off a boom system to a c130 that would be the business. But i imagine a boom would create a massive lever moment and ne a significant challenge
There is a hose & drogue adapter which can be fitted to an AAR boom to enable refueling and known as BDA for Boom-drogue adapter, these can be fitted on a per mission basis. Given how AAR booms appear to work, I suspect that a similar type of adapter to turn a hose & drogue setup into a boom is not possible since the boom has an operator aboard the tanker aircraft that operates the boom which is inserted into the receiving aircraft. With hose & drogue, the receiving aircraft has a probe which is inserted into the drogue to take on fuel. I suspect it would be rather difficult and potentially dangerous for a pilot to attempt to fly their aircraft into a probe being dragged behind a tanker, with the pilot responsible for making all adjustments so that the probe is inserted into the receiving aircraft.
As a side note, there are (and have been for some time) a number of MPRS or mult-point refueling systems in service which can provide a boom tanker with additional, hose & drogue refueling points. This was developed at least in part because fighter aircraft cannot take full advantage of the max refueling rate a boom can handle, whilst the USAF (and likely others as well) found that tanking missions to support multi-aircraft sorties were easier when a single tanker could refuel several aircraft simultaneously.
In some respects I do think it would be good in the RNZAF were to acquire an AAR capability, but there would need to be quite a bit of thought put into it, lest resources get wasted on a capability that NZ could use, but might choose not to.
