A figure 8, with 10mm cord like Beeline, or the Reep Shnur in the base tie kit would work. It can be a little hard to control on the single line especially for someone not familiar with that type of abseil. Most 'kits' can be assembled 'a la carte' and customized to the users needs which is great. I would be leary personally rappelling on a single strand of 8mm cord like HRC.
This specific kit, IMO, is better suited to line clearance operations where operators may not be as skilled rope technicians as you see in residential operations.
If theres a place in the boom or under the controls where it doesnt interfere with anything that would be better than kicking around in the bucket.
To me, the take away is having a dedicated system that enables fast response. I believe in purpose had components, stored ready for an emergency. Response time is everything especially if a truck is on fire or hydraulic fluid is everywhere.
