I normally bypass the rails entirely with IWC SMCs. What kind of light are you looking to mount?
Are you looking for something like THIS
I havn't used these so can't comment on that, but I think these are what you are describing.
This is what I went with. Love it.
Wow IWC has some very cool mounting solutions. I'm sure I'll be ordering from them soon even if it's not a light mount. Those SMC's look slick though.
My current light to mount is a G2L and it's family members. One thing that still gives a picatinny strip an advantage is that I will probably acquire a x300 light that I would like to try out on a rifle and perhaps something from the scout family. At $60 each that would start to sting after three of them. Silly next to the price of the lights themselves perhaps, but still....