Could they get a piece of machinery to the airport to tow ( bulldoze ) a disabled aircraft off the runway if required ?
The old bulldoze the disabled aircraft off the runway myth. Ask yourself who "they" are, who are going to take on the responsibility of arranging the purchase of and payment for the hire of a bulldozer and operator. Then ask yourself who is then going to be responsible for the subsequent runway inspection to ensure no debris is left. Finally, ask yourself what would be the minimum time that all this would happen. The airport will just be NOTAMed as unserviceable due disabled aircraft and anyone airborne would just have to figure it out for themselves. If you don't have the fuel to go somewhere else then it is not the airport operator's problem.