If they were designed i.a.w. the required standards and flown that way then they were no less safe than any other approach designed to the same standard(s).
But to address the original question, Scatsta in Shetland only had an NDB approach and an SRA approach. That airport recent lost all its customers so it may not have them published anymore. But when I was based in Shetland the NDB approach was just a normal thing.