From where Renault Master II (Bauj. 2004) foreign start?

Hello, ( ) It is clear that the battery power is not enough for the diesel. However, it is annoying to open the access to the battery in order to start the car outside. It should be possible to start the car from the engine room. But all “experts” (div. workshops, breakdown aids etc.) have found no way to do so. I can’t imagine that it is really like that. As an alternative, I thought about a cable from the battery that is between the driver/passenger seat is located below the floor plate, ( ) to put in the footroom, in order to be able to log there if necessary to start. I do not want to put a cable down into the engine compartment, because this would then be pulled a piece when the battery is disconnected.