Hot refueling is no probs, as long as your CAA law allows it. Looking at the recommendation from the UK, I would say they would not want you to do it with a Jet Ranger, as it could be argued that the exhaust is on the same 'side' as the refueling point... Stupid but...
While avgas may not come in jerry's nothing stopping you from putting it into them for your job. Same as jeta1 can be transferred, and I have transferred thousands of litres from bowser to Jerry into machine in my time. Throw a can or two of gas into the machine every load or 3 or 4 to keep the load at max and fuel low to increase productivity and$$$$$ up. Hard for people who haven't been paid by the acre/hectare/kg/lb/ton/load etc to understand that sometimes you need to keep fuel to a minimum.