I am not a mechanical engineer, so I will not make statements concerning the expected life time of the pictured system. I can say that it falls outside of what I was taught to be safe practices for rigging.
Climbing gear is designed to be strong enough and to be as lightweight as possible. Therefore much or it is made from high strength aluminum alloys that have great strength to weight ratio, but terrible fatigue life. What that means is, that if you apply a constant load to the device, well below the breaking point, eventually due to internal stresses, the device will fail. This process is accelerated by stressing and unstressing the device, like what happens when using it for climbing. THAT is why aluminum climbing gear has a five year use life. There are tests that can be used to recertify aluminum devices, however; these tests coat more then replacing the device.
Also the WLL rating on the equipment we use for overhead lifting is in no way related to the stress limit testing used for climbing gear. The 27kN rating on a caribeaner means that it can withstand a force of 27 kN once. After that one event it is understood that it will be destroyed and thrown away.
Lastly, if you do use climbing gear for overhead suspension and something does happen, it will take five minutes to find an engineer to testify against you.
Sent from my neural implant
