The brake lines that are affected by age are the rubber lines. If you feel a need, that MB didn't, to use metalic brake lines where they use rubber, I can't help you.
To try and re-engineer something MB has spent their life doing makes no sense to me.
Do you presume to know something special about your circumstances that MB didn't understand? The rubber flexlines under the most abused of circumstances get the job done. What else is there???
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician