Perhaps a compromise- Necro should get a regular workbench, but Advanced Workbenches should have delicate equipment that needs repair/materials to make it work, as well as power.
(And they would be located at VC Vault, Mariposa, Sierra, Enclave Base, BoS HQ (sattellite bases?), and Necropolis. NCR would have one for its NPCs but not players- maybe you could sneak in.)
Advanced Benches could be chargeable like cars plus you have to add junk, alloy, metal parts, and electronic parts to get it running.
Not a whole lot- say 50 units of power ( 1 per SEC/2 per MFC) for 1-5 craftings, and depositing 6 junk, 4 EP, 3 metal parts, 2 alloys, and 1 Good Metal Part makes the bench functional for 5 minutes Real Time.
Like a crafting vending machine. Materials to fix it up, power to run it.
Just craft fast to make the materials count for more.