Insuring a Columbia 400 & weekend only insurance

On 2007-07-14, Ben Jackson wrote:

If you rent it, your insurance will skyrocket. If you add a few
named insured, the cost will only change by going up to whatever the
least experienced pilot's rate would be. However, there will
probably be a limit to how many you can add.

That's reasonable. What about the case of renting the plane only to
those who are listed on the policy (since they are not partial
owners)? I wouldn't need the insurance to cover walk-in pilots who
aren't listed, because it would probably only be a few people
involved.

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