The problem a lot of us older pilots have, is the one about being in cloud without a radar service...... You rely on the Big Sky theory, in other words that no-one else will be in your cloud. This will work 999,999 times out of 1,000,000.
How do you cope with aerodromes outside controlled airspace with IAPs and procedural approach control, then? Or indeed for that matter, with enroute IFR outside controlled airspace where no radar service is available?
There is, unfortunately, no such thing as "safe" in aviation, only "safer". Risks are always relative, and there's a strong argument to suggest that without a radar service you are safer overall in low-traffic-density cloud than in high-traffic-density VMC, as see-and-avoid is imperfect.
Of the risks to be assessed in any DIY instrument let-down, I would have thought that the risk of collision with obstacles or terrain vastly outweigh the risk of mid-air collision.